Les
like you I have dabbled in the satanic multi choke having had two multi trap guns. Like you I never felt comfortable with anything other than 3/4 full but I suppose old habits die hard. DTL scores never improved with more open chokes, apart from that I just don't like multi's I don't like them and I don't need them. I prefer to shoot 3/4 full at all trap and play with cartridges if I want more open, such as 8s for DTL . If you want tight then F black trap as someone said previous very dense centre and no fliers so big big impressive kills but miss em and that's it and very unforgiving for DTL.
My point is that cartridges rather than chokes make a big difference.