Interesting scenario. I am not a big submarine fan, myself.
I proceeded just like Donald with massive airstrikes which killed the air bases and the surface group rather easily.
I lost a bunch of submarines, getting ambushed by an Akula which sank 4 conventional subs early on. Two further subs were killed (probably) by ASW aircraft, probably a lucky streak for the enemy (MAD contacts?).
In all, I felt that detecting enemy subs was rather more difficult than what I'm familiar with. It took my subs quite some time to pick up the enemy units, sometimes the only thing notice were inbound torpedoes, although I kept speed low at 5 knots all the way to the bastion.