
Originally Posted by
MartianDestiny
My thought: Don't make a judgement on the shifting until you get the fit right. If you aren't comfortable holding in the drops it's obvious why you'd be uncomfortable shifting down there.
Sounds like you have some pretty significant bar positioning/fit issues to work through and they are ABSOLUTELY effecting your comfort and ability to shift, no question.
Focusing on using your core (abs) to hold your body up on the bike (rather than your arms) will help in the long-run, especially if your goal is a lower/more aero position. But it does sound like your bars are too low and potentially too far out in front of you, especially for right now.
One thing you could potentially do is work on "moving" on the bike on the Trek you are more comfortable with. Ride one handed (both sides), try no handed, one handed and lean/bend over to reach something, reach for bottles, reach for imaginary bar-end shifters, sit straight up and stretch (that's way more advanced than it sounds, don't try to do that all at once!), etc. Balancing a bike while doing these things is a learned skill, and it's by no means easy.
You'll have to practice again when you transfer to the LHT because the bikes will handle differently, but you'll be more confident and it will come easier if you can already do it on the Trek.