Have you tried a timing light yet? Rent one from a local "big box" auto parts store. Attach the power cable to the battery and the lead to the #1 Spark plug wire. Shoot the strobe light at Harmonic balancer and see if you are at 15 degrees. That is the only thing that I can think of other than your timing belt is still off. Like Adamzan mentioned earlier, you may be okay with the tooth count from cam to cam but, off of the tooth count from cam to crank shaft. Also, you mentioned that the crank mark was difficult to determine ... this could be a cause for the lack of power/off time as well.
Look, I have been into my timing belt a couple of times. I wish I was there to put my hand on your engine to see what you seem to be missing.