Whille the LA is a good little engine, it does have its downfalls with the air bleed carb. Air temp will have a greater affect on these.
If you have the money get an OS 46sf or the TT pro 46. Have someon at the field help you. Also like the above pro's have stated, go through your fuel system.
I cant believe you dont have anyone else that can look at that LA. But it also depends on how you broke the engine in. If you've overheated it then there may be no hope for the motor.