quick question..

i'm running in an engine axe cobra x1 evo .21

i've done about 2L through the engine now and it's starting to get some serious top end speed.

when tuning this engine i have found myself having to richen the mixture to get a better top end without lean bog (which i have experienced when running this engine in). so i richened the HSN by upto 1/4 turn..
does this seam right with a new engine? is this just the engine wearing in and finding new RPM?

also. when applying open throttle, backing off, then applying open throttle the engine would surge slightly on the 2nd take of... once again, is this just a result of a too rich mixture... both HSN and LSN, and/or the engine wearing in?

at all times the engine has blown blue smoke. with the spit test . spit evaporated after about 6 - 8 secs.