I added 8g of lead to the head. I used 4 strips at 12 o'clock and 4 at 3 and 9 o'clock. I used 1/4 " lead tape, so I had the strips on both sides of the string. So there were 16 inches total at 12, and 8 inches at 3 and 9 each.
I did have a little soreness in my arm after my second match with the additional weight. I think I should have slowed down my schedule just a bit to give my body a little time to adjust, but I didn't. Everything seems fine now, so just take it a little slow at first if you end up adding a significant amount of weight.