Speed Triple Sluggish Throttle Response

Do you think this could be related to when you filled up with fuel?
Poor fuel, contamination, was it raining heavy causing water getting into the tank?

I have a 2010 Speed Triple and use Red-X quite often, an additive to keep the fuel system clean, it also helps condition old fuel, you could try putting an above normal concentration in to eliminate the fuel element

If you ride on or near a dirty area of road causing air filter blockage, so possibly cleaning/replacing the air filter

If spark plugs are old, check and replace

If you have access to an OBD2 cable and use TuneECU on an Android phone or use a laptop, this can reveal any imbalance between the throttle bodies

But I think it is fuel related