Rate of balding is slower
I read somewhere that if the father is not bald but the moms father is bald, the child will bald but at a slower rate. Balding doesn't mean you are always going to end up at nw7. It could mean you stop at nw3 or nw4.
Increase finasteride dose
The effective dose is 0.05 mg for finasteride. I recommend increases to about 0.5 a day if 0.25 isnt cutting it. Don't increase too much if you are worried about sides.