Saekee, if you're out there, I need you

I'm planning my endgame gearset for my VKF/Assassin. Improved Feint has been a joy, thanks again to Saekee for being so vocal here about its value. As I approach cap, I am left wondering if I can get my Bluff high enough for Feint to continue to work as it has when I plan to transition to Elite+ play. I am going to do some testing tonight in LE with my at-cap mechanic to try to figure out where it needs to be, but I did this late last year to some degree and the results were pretty mixed, as the same roll would succeed on a mob and then fail on the same mob another time.

I would love to hear about others experiences RE Bluff DC's in LE quests (Sharn, RL, new stuff). I don't really understand how they expect DEX/INT rogues to invest enough in CHA to get the Bluff required to use it in endgame content. I'm estimating a Bluff of around 90 with my current gearset plan. My limited testing suggest that this is simply not going to be good enough. I also have some reason to believe that 100+ could provide more value, and I COULD maybe build in or make swap gear for ins Bluff 11 and qual Bluff 5 (and ins CHA). Again this is based on my very limited testing, so I would really appreciate any knowledge that you all can pass along.

Thanks!