What can I do to help improve Minoxidil absorption?

Hello, currently 5 months on minoxidil and 1 year on finasteride, i got an oily scalp and it seems that the minox doesn’t absorb if I’m using a regular shampoo, because I’m waking up with bald spots the next day. For a good absorption i have to either use micro needling before the minoxidil/ or shampoo with Head and shoulders, which also give me side effects of fatigue and migraines. So I’m stuck. I want to quit the minoxidil, but afraid to lose more than baseline. What can i do? Thanks.