I'm no one to answer any of your questions regarding your c41 processing.

I must congratulate you on the quality of your color.

But the spotting on the negatives I know is your next quality control project.
You know where the problem lies with the gritty residue.

Now your mentors will assist you there I'm sure.

I'd celebrate with a swig of wine... crack open the vintage wine when you have everything under complete control!

Well done!