The service department just spoke to Polaris and was told that they know about what they call "RPM Flare". And it's normal! RPM flare up when shifting. RPM dropping under 500 is part of the flare! Good luck not crashing your Slingshot! I am so pissed I can't finish this post.
At the risk of being labeled a 'speculator' , this response from Polaris is completely consistent with my theory of why the throttle response was intentionally programmed to be very slow. I won't bore everyone by repeating what I've said before but there were several reasons, mainly to protect the Polaris designed portion of the drive train.
So that being the case, Polaris is exactly right in saying this is normal. It is just a byproduct of their design choices.
It still sucks though.
Polaris, if you are listening, may I make a suggestion...
Offer the option to flash the ECU with faster throttle response but with the proviso that final drive belt and/or bevel drive life problems will not be covered under warranty. I'll take that deal in a NY minute.