Welcome and thanks for sharing Tom.
Do you think that a 32mm carb would do a better job over the 28 with the 150 kit on??
Because looking at the Honda CRF150R specs,it has almost the same spec as the 150 kit(bore & stroke wise) but the crf is utilising a 32mm pumper carb.I'm not sure about valve sizing and port flow for the crf,though.
Cheers.
Merry Christmas!