Just a thought as I originally had the same impression (no tune); perhaps you (as I was) too quick letting off the clutch. I now give moderate revs at takeoff (old pilot speak) while very slowly easing the clutch out, now cures the dropping of revs...give the engine a chance to take a deep breath of fresh revs! It's all in the reference of "practice" and "experimenting" to find perfection.I still have an issue that existed before the tune whereby if I don't put enough rev's on the bike when taking off from the lights or a junction, the bike seems to rev and then drop revs on its own. I have to rev reasonably strongly if I want a smooth take off from stationary. Likewise, when taking off from an incline, the bike needs to be revved. I wouldn't expect that with so much torque available.