Great to hear the KTM lives up to your expectation.
Does your bike have a trip counter if so then use that more than your fuel gauge , work out a safe KM with about 2 litters left in the tank then use this measurement as a safe travel range for fuel.
The problems with gear changing is just down to getting used to the gear set up on your bike but sometimes just moving the gear level up or down a bit on the spine could help IMO it needs to go down one so your foot sits down a bit so when you kick up a gear you travel passed the natural position.