#1 is almost essential.
EQing to address a hihat that is too aggressive for a given song is fraught with knock on effects as is addressing kick drum problems, (mainly the modern tendency to have more click than thwack), and so forth could be better addressed if drums were provided as individual tracks or, at least, stems, (OHs as a stereo stem, kick as a mono stem, top and bottom of snare as a stereo stem - allowing one or the other to be tweaked or muted before using it in mono - toms as a stereo stem etc).
I spend more time working on the drum sound than all of the otehr BIAB components combined.
It MAY help with the present set up of a single stereo drum track to have some idea of the recording technique.


Cheers
rayc
"What's so funny about peace, love & understanding?" - N.Lowe