12152 H 20000 is the TP I use to tune 97W in. No problems here with either my X2 M1HD+ or my Freesat V8 Finder LNB is an Avenger KSC322-2 and using a Dtv Slimline dish
I just pulled out my Viewsat Ultra from storage, erased old channel list and blind scanned 97w and got rtpi at 12152/H/20000 3/4fec. You must have another issue Nigel.