Guess I have to get off my bum and send out some more queries this evening. I haven't sent any in weeks.
I've done a little tweaking to Channing as far as character motivations. I wish I knew which characters specifically the agent felt have squishy/fuzzy motivations, but I think I can guess. Of the four big players, Augustine is an open book who just wants to have a good time, Caroline is basically trying to make the best of a bad situation, and Harry is a bit out of his mind (and it's fairly obvious he's insecure and does almost everything just to prove he can--he says almost those exact words). Everett is the least concrete, thought it's clear in my mind. I've worked in a few paragraphs and reworked some dialogue because I don't think it'll take much: after the duel, his goal is to make up for his sins by doing all he can to fight slavery. I may give it a bit, run through it again, and see if I can pinpoint any more places where I can clarify his position.
As far as the criticism about the time jumps, well, I knew it wouldn't necessarily be to everyone's taste, and it is what it is. I've tried different solutions and think this is the best option. In the end, it's a matter of opinion. Betas thought my previous arrangement didn't work but didn't say it was confusing (as this agent implies it is). So . . . I just gotta find the agent who doesn't mind it or has a simple solution (ie "rearrange these chapters and it's fine").
The hunt continues . . .
/thinking out loud