have you used drop box or zshare or one of the many other FTP servers?
good to see you are enthusiastic about your work which is the most important thing. some of the nasty comments you received were probably due to some of your early comments but in general you have been given lots of great advice.
Stems are good but to really check phasing etc then separate tracks are much better.
I know you are against tightening timing but these days it is important
https://www.youtube.com/watch?v=2yOEs_whudo
you don't have to quantize the life out of it but at least make it sound like they are not out of time.