[Raptor]

That is very possible, try redoing the compression test after squirting about 5cc's of oil in the cylinders. If the numbers get better, you found the problem. One thing also I noticed when I came out to do the timing belt, the cam gears were out of phase, If they were that way when the head was bolted down, there is possibility of bent valves depending on the crank position at the time (You should always check this when bolting a head on). I would do the compression test first. That will give you the best information right away.