I just got my dle 35 running pretty well !! After about 2 weeks of pulling my hair out. "And I am the motor guy in our club"
1. Does it miss without the cowl on?? problem could be either heat or pressure related.
2. Tune the high speed first then the low. back them out to 1.5 turns start there. Cowl Off !!!
You have to first isolate what is happening. The only way to do that is to run the motor with ample airflow and see how it responds. Mine ran awesome for 30 minutes then sat for 2 weeks because the weather went to crap. Then wouldn't run..... ended up rebuilding the carb now she runs great without the cowl on..... but as soon as I put the cowl on it misses like crazy and I have to back out the needles to get it to run fair...... I am guessing a heat issue "with mine" could be the same with yours????