The rear suspension needs to be addressed, but I wanted to try racing first before I did so.I would try and get the 26" to work for you. Play with tire pressure and launch RPM. What suspension work do you have in the rear?
I had 275/ 50s and went to 275/60s and yes the launch is "easier" but I will be going back to the 50s or a 26" stiff wall when they are used up. I feel I am leaving some behind with the taller tire.
I'll admit that I was nervous not knowing the whole procedure. I wanted to air down but didn't know if there was an air source to air back up. I later found out that there is. I'm sure that my rear coils and shocks are way too stiff as well.Looks like you have some decent stuff back there. They key is making sure it all works together.
the easiest place for me to start was set my tire pressure and check it before each run. Say 15 psi, then make sure your burn outs and staging procedure was consistent each pass. Increase launch RPM till you spin. Once you spin try airing down a PSI or 2 and see if you can start launching at higher RPMs with out bogging and they car still feeling stable at speed.
That is what I did before I began seeking help with suspension adjustments.