i play a high tempo high line pressing 433, but on defensive or counter mentality with fluid or very fluid shape and it works wonders, my front 3 are 2 inside forwards one support one attack with player instructions to clsoe down much more, tight marking and tackle harder and in the centre i play a defensive forward support this set up works wonders for a high pressing team and with support duty the defensive forward scores loads, usually getting on the end of crosses or winning the ball and running thru 1 on 1, recently i tried him on defence instead of support so he was deeper as i felt he was being isolated and its amazing! he plays like a false 9/ deep lying forward dropping back and linking up moves sitting between the lines etc but still puts in a shift when we dont have the ball, its such a good role you should try it to aslong as he has support from the wings or a shadow striker advance playmaker behind him hes a beast