If you get red dots from clamping-Read this
If you don`t want to get red dots after clamping, Try this:
Warm up with a rice sock for 5 min, Get a really good warm up.
When you start clamping increase the pressure gradually, Do not start at 110%, Let it slowly expand.
Normally I get 20-30 red dots, Today I got none, This worked for me so try it out.