It could be popping out of gear cause you put in Transmission fluid instead of regular oil... Honda's are DIFFERENT, even dsm's use MTF but Honda/Acura use engine oil...
What did u use?
Honda Manual transmission Fluid?
Honestly, I never used this I just followed recommendations and use Engine oil...
I am not positive, but I'm pretty sure the Honda B-series trannies don't use a "manual transmission fluid" they are supposed to use 10W-30 oil (not exactly sure on the oil)
Could be your problem, I'd say drain it out and put in some synthetic oil, see if it fixes the problem.