However, since I had a CFI check, he said that it was perfectly ok to take off with full flap on a t&g - it measn there is less work required during the ground roll. However, I ahev never really had any issues with this and when I ahev done three solo T&Gs, I brought land flap up to use just t/o flap and was fine.
I am surprised if, as a student, you have been allowed to do solo touch and gos, and dumbfounded if a CFI told you to do so using full flap.