I totally agree, though it seems to work on the other Roberts here (perhaps larger frame/max tubing helps) Thinking about it, my IF is exactly the same main triangle as this and a 3t'T works well. I have a silver Thomson X2 left to try, then I'm ripping the Nitto stem off another bike as I'm sure thats the one.
Cheers fella! I've not had as much time as i'd like on it, but i believe/hope you might be right.
I am pleasantly surprised how well the silver (cheapo Planet X cnc) stem sits on this frame, it was the same on the nagasawa, shouldn't, but does. Worse case, i'll just stick with a 120mm version.
noted, yours if you want it, Matt