[CB..]

your absolutely right about the turn thing--the DD's allways react to your turn when close and directly behind you even tho they have no feasible way of knowing you've made it ( and the imaginary Captain of the vessel can't guess right EVERY time !!)

i'm not suggesting tho that any one should use the sim.cfg uber effect as any sort of soloution to this sort of behaviuor-- but only for those folks who literally have to surface at flank in the middle of a convoy before the DD's detect them (this is not an exacegeration)-and then only till some-thing better comes along-- the problem with useless DD's is not a subtle one -- it really is that bad for some people (me included)

lets keep pouring info and thoughts into the thread because bit by bit a clearer picture of why all this is happenning will appear--

quick thought on the turn thing-- is it possible to increase the noise generated by the DD props this might mask the u-boat as the DD excellerates to make it's DC run?
or alternatively decrease the maximum depth (if this actually works?)
of the DD's sensors to 150 metres-- i rememebr i kept reading hints that most of time DD's didn't understand that the u-boats could actually dive below 150 metres and nearly allways dropped their DC's at that sort of maximum depth--even late in the war-- there was a story of a type 9 transporting parts of the ME 262 and variuos scientists to Japan in order to help with the Japanese research into nuclear weopons - and how they when attacked simply went down to 300 metres and were perfectly safe as all the DD's dropped at 150 metres max--tho dunno how much sense this makes-- this would mean that if you went below 150 metres you could lose them --- with the caveat that you ain't going to sink many ships at 150 metres! and if your damaged you can't perhaps get that deep--uber up the phones to compensate ?