Yea at that low of rpm it really does sound like something that's not related to the boost it system. The nytros always do have a low rpm hiccup, a completely stock sled has it the stock exhaust just muffles it. I just can't judge how bad your hiccup is Online. Perfect example of this is a stock nytro with an aftermarket exhaust. You can really hear the crackle and pop on low rpm when the throttle is first cracked. You are correct the stock fuel system works as it did from the factory. That's the beauty of boost-it, the sled doesn't even know its not stock. So the low load, low rpm stuff should all be handled by the factory system. 1900 is barely engaged on the clutches so I don't think the sled will be making any boost that early. So the boost-it system should not be doing anything that early I believe. How did the sled run before the boost-it system was installed? How was the sled set up before? Was it boosted? stock?
Sorry for the million questions, just trying to help ya out.
I know every sled is different, but usually a sled that has to be set up way in left field to make it run is a red flag that there's another issue. Either it be with the stock or boost-it system.
Cheers!
