Low compression

Hi All
I have a 2005 Aveo, which I purchased knowing it had a blown head gasket, turns out that it overheated and the head warped. I had the head machined from a local performance shop, installed new head gasket, new timing belt + tensioner water pump etc, all the basic parts. assembled everything back together tried to fire it up and discovered very low compression
Cyl Psig
1 70
2 55
3 52
4 55

Tried adding some oil into the cylinders and the compression did come up a bit so i figured I would replace all the piston rings and connecting rod bearings. I used standard sized rings and bearings. again I assembled the engine using a new head gasket, only to find out the compression is still very low
compression went up by 20 psig but that's it.

I have verified the timing marks on the cam gears and as far as I can tell it all lines up correctly. I am now at a loss to explain the total loss in compression. I can understand having maybe one cylinder or even two with lower compression but all 4. Currently I am trying to get a leak down tester to help find out the problem, if anyone has some other ideas please let me know.
:banghead:

Thanks

It's odd that all readings are relatively close other that #1. I'd still be leaning toward a timing prob. I'm assuming you had the valves done at the same time as the head was planed?.....Mike