With that said, there shouldn't be any need to do a mashout if you're not sparging.
To be clear, the purpose of a mashout is to lock in the fermentability of the wort so it doesn't change during a prolonged fly sparge, and it is ever so slightly helpful for grain bills with high amounts of flaked grains that contain large amounts of beta-glucan such as flaked oats or rye.
Since you're using a bag or basket of some kind presumably, and not performing a long hour (or more!) fly sparge, there's no need to do a mashout. If you're seeing differences in conversion and a raise in gravity, then you should probably look at your mash conditions themselves to improve the mash instead.