@Bearback thanks again, the Spark does look interesting, eg ST 910 TR, with 120/80mm rear and Fox 34 Perf Elite Grip2 140mm fork. 12.7kg.
I’m not racing at the moment but looking at XCO/XCM in age group, maybe XTERRA (have triathlon background). Mostly it’ll be trail+ for fun though, red graded UK stuff.
Also relevant perhaps is that the Oiz I’ve spent 2 years on is 68deg front, from just before they slackened it by 1deg. Quite a handful when chasing pals downhill on their Stumpjumpers, Tallboys and Ariel. Previous experience was with much older geometry, having spent the intervening decade on road/TT bikes.