Some riders are super-sensitive to tire pressure, others to saddle tilt.....me, I feel the pain of a crossed chain and love the harmony of a nice chainline. Maybe in my cycling childhood somebody casually tossed off the "Don't Cross-Chain Law" and it somehow was scorched into my cycling conscience...a landmine of hair trigger guilt and a fear of cataclismic if uncertain consequences. And this was before relatively wussie and short-lived but expensive 10 speed chains.
I look down, see the severe deflection from Big Ring to a deeply inside cog...I feel pins and plates grinding and squealing in chiropractic agony (sorta) and I'll even do-- a Double Shift with dt frictions.
My Question #1: How many diagonally placed cogs do you refuse to shift to except in dire need. I realize some people without souls are insensitive to their chain and observe no limits. OK. What are your limits? On my 9spd I usually declare the 2 farthest cogs "off-limits" most of the time.
Question #2: A current thread has re-awakened my certain-I-gotta-get-it need for a compact crank. Has anyone experienced chain rub on the inside of your big ring going from your inner 34 ring to an outer cog? [I know, I know...I'm obsessing again.]