If ennemy is sticking close, don't be afraid to use backward High Speed Movement to teleport on safer place to use the Blast Move, as Gohan's Base Ki is at 3 Ki Bars.
You barely just have to hold the charge button permanently, and perform the move when ennemy is getting up ! Easily spammable, due to combination of low cost, standard natural Ki stat and Base Ki at 3 Ki Bars.
Godlike move ! An instant accurate 8-shots barrage which deals up to 8.000 HP damages, for only 2 Ki Bars.