TREs have almost effect on 650s. It's 1000s that are restricted. How long have you been riding the bike? If it's a short time, you just need to get used to the feel of it. If it's a long time, it may need a new TPS or at least an adjustment. A TBS only affects idle and just off idle and has to be way off to be a problem. Fueling is not an issue on a 650 unless the airbox and exhaust are extensively modified.