I would like to pin everyday, but I'm only comfortable with pinning delts, and quads. I wouldn't think it'd be too bad if you pinned each evening before bed.
Has anyone else pinned prop ED while only rotating 4 sites?
Have you tried any other sites? I would never pin ED on only 4 sites. I wouldnt even go EOD on only 4 sites. That will cause a lot of scar tissue that can be avoided by just using more sites.