Marksmanship can keep up everything without a problem, the only limit to that is player skill. In Survival's case it's a mathematical impossibility to have enough focus to do all the shit on CD.
Flanking Strike's cost needs to drop, since that's the biggest spender by far.
You need to Raptor Strike every 15s, 30 focus per 15s or 2 per second.
Flanking Strike every 5.63 seconds for 50 focus, 8.9 focus per second.
Laceration every 12 seconds for 35 focus, 2.91 focus per second.
Throwing Axes every 14.1 seconds for 15 focus, 1.06 focus per second.
To do all of this, you need like 15 focus per second to play around with. Keep in mind that this is just to JUST about do it, not accounting for any focus you waste (and you will, when doing back-to-back Mongoose Bites) and the fact that you'll pretty much always refresh Serpent Sting and Laceration early. They are Pandemic-affected, but most people are retarded and just use Laceration on cooldown, or use Raptor Strike when they are not supposed to, etc.
Even worse if you go with Way of the Mok'Nathal. Then Throwing Axes is not a problem, so discount 1 focus per second, but now you need to Raptor Strike every 8 seconds instead for 3.75 focus per second instead of 2.
You have a passive regen of 10.56, so you're waaaay fucking short. This is with PvP realm levels of Haste btw.