I'm sort of new to this, but have been lurking for awhile around here
I'd say go for it if you think you paid attention to his advice from before (I know you scrapped the last book, but making sure the same critiques he gave for the last one can't be applied to the new one too). I'd imagine he'd be pleased to see you're not the type to get arrogant and react to critique by turning away from the agency all together. From what I've read in the advice from agents section, I'd mention you've queried before (so they don't go searching around wondering why your name's familiar), that you took his advice to heart and applied it to a new, different project.
I think it shows you're humble, but once again, I'm definitely a newbie, haha. Good luck!
Super cool he gave feedback though, even if it was negative!