Wow Solo, quite the thread you've started! After reading all posts, i though of an eleborate comment, but... i don't have something! As i don't have any experience on FP's and hardly on CP's.
I know you're 'fighting' the FP, instead of 'proactively' controlling it. I've put the 4th and 5th packs 'through' my HDX today (got footage too! Post that later, i'm on holiday (again! )), to trim it all out and what i've noticed is that now i have way more space (although sloped grass hill) i can react much more in control instead of 'panic' reactions to keep it from hitting something. Immediatelly when the HDX came close to anything or even with the tail near the ground, i started to overreact/overcompensate, causing me to have to fight to get control back.

I put the stock carbon blades (hmm, maybe time for traininggear... or not! ) on for the flights today, instead of the 'weaker'/more flexible and shorter plastic blades and i've noticed much better response and more docile control. So you might be on to a good thing with the blade-modding.

About the twitches, how sure are you those aren't radio-glitches? Keep hearing about those when i'm at the LHS, apparently something you'll learn to live with or cause you to switch to 2.4Ghz . Is it true that some of the 'older' servo's sometimes cause to twitch/jitter themselves when they've continiously pushed/pulled (so not stayed in fixed position)? If so, maybe that's causing the glitch? I don't believe that anything external would cause such a sudden and hefty twitch in the flybar. Winds/draft would have to fight the rotational force, so that should be a more docile reaction... Maybe sun-rain (heavy electromagnetic static caused by major events on the suns surface)?

We all know you can take a hit, but why would you need to?! We're on here to learn right? Not to get talked out of flying, but to get into flying!

But if you want a hit; maybe it's year of birth related?! (Sorry, that's something i say to my family most of the time when they cant get something working the way they want to i don't know if it's inappropriate here, but i'll take the hit if not ).


P.S. I've managed to crash my CX2 today for the first time in 'ages'! After the 'heavy' and concentration-draining HDX 'flights' i picked up the CX2 for a good beating around the yard/garden, all is well until i got balsy trying a stall turn . FFWD (well, as fast as a CX can go), pull full back on the pitch, just a bit of right aileron and you have yourself a flying brick . Good thing i have my HDX and now my CX2 can be my beloved 'bashing around' baby, instead of my 'carefull, watch it!' baby .