It’s actually this very thing I pointed out in the Hybrid thread. Kryptonians being hyper sensitive to all energies and radiations (as well as their ability to store them), combined with a Saiyan’s physiological response to Blutz Waves mean that, unlike an ordinary Saiyan, they should mean that the Hybrid gets to turn Oozaru whenever they want, or maintain it perpetually. And because their cells are supercharged/enhanced to be more efficient and bring out more power (hell, the Sun literally amplifies basic physical processes of Kryptonians at a cellular level, making tasks like basic thinking turn into supercomputer capacity), their forms would be superior to that of an ordinary Saiyan. So, for example, SSJ might be a 100x/SSJ2 level jump for them instead of 50x.
That combined with Saiyan strength growing in response to radiation means they’ll be constantly growing in strength from the Sun and Moon.