Its ok that your not at TDC at this point as long as the crank and intake cam have not ratated and they prob. haven't. The good thing is only at TDC mark 0 and at 180 are there actualy pistons up at the top of any of the cylinders.

Because your exh. cam has gone clockwise. Holding the crankshaft in its present position and rotating the exh. cam counter clockwise to take up the chain slack will only move it closer to the correct cam timing and with the chain on you cant over rotate it so I would just have someone hold a socket on the crank to stop it from rotating counter clockwise, and rotate the exh. cam counter clockwise and listen for a click noise from the tentioner. Doing it this way will remove any slack from the rite side and put it between the exh. cam and the crank with the tentioner between those two.

If you dont hear a click or it doesn't seem to take up the slack give the tentioner rail a little push with your finger.
You just don't want to pry it with a lot of force as that may move to tentioner up to an index that is to tight and couse premature wear to the guides.

Hope that helps and will be waiting for the good news.

Dave..................