Missing a rail shot in 1.2 will hurt but not too much, the change is a lot less significant than people are making out.
I am far from the best but I do pretty well. I run a similar build(probably posted by someone before so i doubt its remotely new) but 8/8/25 I use FB far too much and the 6% damage increase is actually quite nice. I also really like the 8/6/27 builds, messed around with a variation but 8/8/25 really suites my playstyle. Also tried ditching Rapid Venting because I dont really have heat issues and taking the Infrared Sensors because a good OP can double stun you and drop you to 40% before you join the fight. But if you get that first shot its game over. Spent the last two days try different tweaks to my build and what I have now seems to work out the best for me. Solo queuing I shift a few points around.
I have like 110% maybe a tad more tech accuracy and maybe 103ish ranged. Not that high and I rarely miss a rail shot, the target usually has to have popped some cd for it to not land.
Big trade off is my lack of crit and surge. I don't have any BM gear, but I'll probably replace the mods for more crit and try and find a middle ground. I think a solid 100 or even 99ish would be sufficient.