get on minoxidil, and apply it only to temples
i think you will get good regrowth seeing that you still have a strong hairline
during my experience (1.5 years on propecia), it helped thicken up everywhere, but didn't do much to the temple region. i've been on foam for almost 6 months and it's done it's job in regrowing and thickening the hairline.
goodluck!