Sounds to me like your top end is still too lean. I'd start with the main needle 3 turns open at least, if it still won't go full throttle then I'd look for an obstruction in the fuel line or presure line to tank. You really can't open the main needle too much when first breaking in an engine, just run it up rich then lean from there. The settings given in the manual are suggestions, you gotta go with what works.

Andy