My savage with an Axial .28 smokes steady around half throttle. I think what happens, is the carb opens enough to get almost full fuel flow, but you are still limiting the air intake. You might try leaning the LSN 1/8 as long as it doesent seem too lean at other times. Leaning the LSN just a little may fix your problem. I run mine pretty rich on both needles. If i run at half throttle some it does load up a little, but nothing that doesent clear out pretty quick when i crawl on it. You may just need to lean the LSN a little. Give it a shot. It cant hurt.

Eric