Ok, here are the results of my compression test:

Cylinder #1 220
2 215
3 215
4 220
5 170 (230 after oil put into cylinder)

The Piston must have been stuck on the 5th output of the IP but isn't stuck now, they are all shooting the same.

When I took the injectors out, there was no heat shield installed in the first cylinder, the rest were there. All the injectors were bench tested with a spray around 200PSI with a good spray pattern except for the one out of the second cylinder which had no spray until it hit 340PSI, then it just shot out in a very pronounced line.

What do you guys think?