Your clutch is dragging and will stall in the situation u mentioned. Try and measure your gap and just feel a slight resistance with your feeler guage. I had a simialar situation this weekend and found my tolerances were too close. After replacing with a thinner steel plate I find neutral very easily and haven't stalled it as easily. U can stall even if jetted perfectly and clutch set up perfectly, stay on the gas a split second longer on your log wheelies and u will see the difference IMO. These bikes hate the dreaded throttle "blip". The tech's at Rekluse
tell me these bikes won't stall with their clutch but it's asking alot of these high strung short stroke 4 stokes to ride at lower speeds. I still think the Rekluse
rules, just takes a bit of seat time on them. Be sure u don't have a warped steel plate or worn clutch basket, clutch won't release on off throttle properly.