Thanks everyone, that's a lot of help.
Ahh... measure 66, one of the Scotch snaps I threw in.... I'd like to see if it sounds okay if performed by live people and not my computer, it might come off a little better, maybe a tiny ritenuto at that point so it isn't grazed over so briefly. Otherwise, I'm not sure what to do about it.
Thank you for confirming the playability of the high 'cello parts, I wasn't entirely sure I could write whatever I wanted up there, but I heard some high 'cello before, it was a beautiful sound and I thought I'd give it a shot. Same with the contrabasses, 1st bass goes pretty high too, I wouldn't have wrote that if it weren't for actually hearing a bass playing that high, I guess you could call it inspiration. Or, if you're an amateur bassist, a pain in the arse to read tenor clef.
I'd rather not transpose it into a lighter key, I like it fine the way it is, I'm fond of dark major keys, I was trying to avoid any potential open strings. Would it be fine if I transposed everything up a tone? This would put it in Bb at the beginning, and Db at the end, is that a little better? If I transpose too high, the 'celli and basses will be struggling with the resultantly higher notes. So is Db better, or would you rather see C# major? Personally, I would go for the Db.
As for the string crossings, I can't change that now, but I'll keep it in mind for the future. That's just one of the challenges I fell victim to in writing for a bunch of low instruments.
