Tim,
It is not uncommon for theses bolts to feel extremely tight. The slide setup on this style builds corrosion in the slide pin hole and compresses the rubber lock pin boot against the bolt. You will have to work at it to get it out. Loosen a little, then back towards tight, repeat getting it further out each time. You may end up needing a new lock pin boot since it is made out of rubber.If you can get the boot out of the caliper support without damage it will be fine. Once it is out clean the hole out so that the pin bolt will move easily with the boot installed.
Here is a pic of the caliper assembly so you know you have the correct bolts.
Images available only to Customers.
Shawn