Ok here is an update from me.
I have been swapping between my Southampton save and Rosenborg save and im using you're tactic and W4nkers 4-5-1v2.
W4nkers seem overall more solid, but there are matches i pull you'rs out, specially if the opponemt play narrow and 3-4-3 etc. It works wonders then with the wingbacks having crazy amount of crosses. Might mention it saved me a 1-1 away on Mestalla and im currently playing at home for EL final spot vs United. im starting with W4nkers, but if i need a secret weapon i know were to find it

The main concern with this tactic is that it tends to get a bit static with the 3 CM's. Although it overall works good i can see it could use some work ,because it tends to eighter leave lots of space between the defence and midtfield, or me not having enough people going forward when i go on the break. I tried as you know to tinker a bit, but i put that to rest until next weekend were i will do a ful lsurvey of the tactics i have tried.
Anyways, nobody can take away the credit you deserve for creating a top notch tactic who is beast for middle+ PL teams (i know that from experience).
I will be back!