Jetting help malossi 210 mrb reed block

i know there been alot of posts about jetting, but i run a malossi 210 with mrb reed block with dual-stage reeds.  also with a pm pipe and 30mil phbh dellorto. now at the moment i have a 55 piot jet. a 142 main jet. and 40 slide with an x2 needle on the top clip (leanest) in a 262 atomiser.

plug is white to light brown, if i raise needle it splutters.... do i go upto a 264 atomiser? as tried different needles, x3 (too rich) so tried x7 (too lean) any help be appreciated, as its starting to do my head in... many thanks, Paul