In my limited experience I have found that in a head see you are much better off trimmed in for the opposite of the two reasons you have highlighted below.
1......it may tend not to rise quite so readily
Actually the main problem I have found is that it does rise and far too easily as you go off the top of the wave if you are trimmed out the RIB is more likely to come off the wave very nose high. I have never found my RIB to feel remotely like its going to stuff when going into a head see trimmed in.
2......raising the bow would present the sharp edge of the V section to assist in parting the wall of water ahead.
No quite the opposite in my opinion the sharper bit is where the bow sweeps up to meet the tubes, the more you raise the boat the further back its going to ride and the shallower the VEE becomes. I find the ride much smoother in choppy conditions when trimmed in.
Clearly different RIBS have different attributes however with mine this is certainly what I have found.