The issue here that you fail to mention though is you are throwing RNG ontop of RNG, and ultimately punishing the healer for being a Monk instead of any other healing class that only truly has to worry about Crit as a factor of RNG. RNG almost NEVER affects what spells a healer can cast, and when it does it is typically limited to their talents which is acceptable.
RM placement and Ultimately Uplift healing (our ENTIRE Burst healing capabilities, since we can no longer Chi Burst in it's replacement) is one, but then to ultimately restrict our Uplift healing an additional time by introducing unnecessary RNG to the Chi generation is just a double whammy. Some RNG for healing is of course acceptable, but when everything comes down to "RNG" to be efficient, you are no longer the reliable, wanted healer in the raid. In fights where the damage isn't consistent we have zero control over if our Uplift will overheal or not, so the only real way to combat that is to simply do MORE of it, so those it does hit get healed, and the loss of overhealing is mitigated by the frequency of your burst. I've gone plenty of casts with SM where I get 1 or 2 chi over the entire channel, and then by the time I CAN do uplift it either doesn't matter, or most of it overheals because of the RM placement RNG.
What I am asking for is to mitigate the loss. Monks are one of the most uncontrollable healers, and we lost a lot of additional control by the change to our t30 talents - albeit this change was necessary to "simplify" the rotation, as it became increasingly reliant apon a weak aura to track RM count so you could decide to Chi Burst or not to under/over a specific threshold. The T30 talent change alone removes a lot of our controllable, predictable healing, and throws us further into a class that we have no control over.
Once you introduce the Jab changes to that extreme without an alternative, you suddenly become the least desired healer on the raiding roster. We need a consistent chi generation in ALL situations, not just SOME situations -- SCK fits the bill on fights like Garalon or other constant AE damage fights where there is little to no overhealing, but when SCK is a waste healing wise, it turns into being doubly useless - it takes longer than jab to generate chi, costs more, and would be wasted healing (even if you cancelaura it it still costs too much).
Soothing Mists, while being uncontrollable, also can be quite annoying as it throws your camera every which way, or if you have the camera follow off it throws your character every which way depending on who you are shooting this off to, causing disorientation and potential issues when you have to move; throwing additional raid awareness in isn't always bad, but it is bad in this case.
As of now, it seems like we are trying to find ways to break Jab Jab Uplift, without providing an alternative that makes sense both logically and mathematically. Again, the reason
behind Jab Jab Uplift wasn't because of it's mana efficiency, we didn't care about mana efficiency in 5.0 -- it was all about it's reliability and predictability. We have control over our burst, even if we don't have control over it's placement we can at least control how much burst we do and when we do it.
Break Jab Jab Uplift, that's fine -- but don't leave us high and dry without a viable alternative that makes us one of the least desirable healers purely based off of predictability and controllability. We need a solution that allows us to be solid AE healers, while also having some level of control over our burst healing.
The goal should be to separate Mistweaving and Fistweaving, removing "zealweaving" as it has been called -- but the focus cannot be so narrow that it breaks zealweaving, but breaks the class in the process.
As of now, you will have to increase the mana cost on Jab more and give more mana back (preferably with our new passive to prevent us from spamming TP as an efficient mana regeneration mechanic) to prevent us from simply stacking even more spirit (which is easier with 5.2 gearing) and using jab. If this trend is the direction we go in, you can expect to have to change something again in 5.3 as Jab will make it's re-appearance in a Jab-Jab-Uplift format.
PLEASE consider an alternative guaranteed chi generation. Some RNG is fine, overburdening and punishing the healing class with RNG ontop of RNG shouldn't be a viable direction. RNG is fine, but not when it's stacked ontop of each other. Reliability predictability and consistency will trump "maybe" any day of the week. We aren't talking about "lets bring a disc because they absorb things and have more utility!" we're talking about "your RNG can literally cause a wipe because you didn't do X amount of burst healing in the last 5 seconds".