U know what ur right.
Goku is the main character so he should have ALL of shi transformations, so it works like this
Goku:
Normal: Kaoikenx1.5, Ussjx.1.5, ssjx2, ssj2x2, ssj3x2, ssj3 full powerx2. multiplier= 36
i mean its only fair!
And vegeta
normal:ssjx2, supervegetax1.5, ssj2x2
multiplier=6
so goku and vegetas base pls are both 20 million but then they transform and vegeta=120,000,000 and goku=720,000,000
and give goku a super fast loading but super strong kamehameha. STRONGER THAN THE FF EVEN THAT U COULD TELEPORT WHILE U LOAD!!! yeah how cool.
no the fact is gokus transformations will balance it more than enough and imagine his teleporting while holding a full powered chou kamehameha in ssj3. Just imagine it.
the only way to balance what hes got would be to give vegeta a Super Final Flash that loads really quickly and takes less ki (ps possible) and is much stronger. Cause even with out kaoken gokus gonna be by far the strongest saiyan.
Now ur asking for them to give him more techniques then his Kame, Cou Kame, Kame Torp, Spirit, Little, spirit? I mean come on its the other characters who'll need some good attacks to balance. Not Frieza, Cell or Buu (they have enough transformaions) but yeah the others