Took a bit of work but I finally adjusted my rotation to hit 5K self buffed DPS... I still think I can eek out a bit more but the rotation is certainly a bit more difficult to execute.
After doing several parses it appears that VT & DP are definitely better to cast than MB during a conflict which means my average MB has blown out from 7.15 seconds to 7.7 seconds, dots conflict with MB quite often at my amount of haste (22%). It was also somewhat difficult to keep my MF ticks at 1.5 seconds, I blew them out to 1.6 but got them back closer to 1.5 at the end (I was able to get under 1.5 pre 3.3 but of course casting more Dot Spells is going to eat into your MF ticks).
So considering I was able to hit 4.6K dps in 3.2 consistently, achieve 5K dps is roughly the 10% increase I was expecting and as I continue to reitemise to haste I expect that to creep more towards 12%.
*Didn't take screenshots this time but if I get some people accusing me of whatever i'll be happy to provide them when I get more time.