I remember as a HS coach and jumping off to a big lead. I made whole sale changes. Your reserves in HS sometimes are a bigger jump down than college. With about 2 minutes of 1st half we had a bout a5 point lead and I put all the starters in and they were out of rythm and we ended 1st half with 1 point lead. We had to fight like crazy to win. Never made whole sale changes aagain. 2 subs at the most. In fact I like to sub 2 a lot.