Anyone who has tried getting just a small dose of jaw Botox with a reduced dosage?

I am a little self-conscious about my angular jaw muscles, though it’s not severely square. I’m considering getting just a small amount because I’m worried that getting too large might cause my face to sink in.

I've noticed quite a few reviews from people around me saying they suffered after getting too much square jaw Botox, resulting in sunken cheeks or a skeletal, sunken appearance. However, if I don't get it, I get stressed because the jaw muscles bulge out when I clench my teeth, making the facial line look uneven.

I'm wondering if it's possible to get a fit slightly smaller than the standard amount, or if it can be used to naturally and subtly refine the lines.

Has anyone tried getting a small dose of jaw Botox with the dosage adjusted? I assume it would just smooth out the angles slightly without side effects like sunken cheeks, right?