Timing belt woe's

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So I have finished rebuilding my cylinder head after I bent all my exhaust valves from over reving the engine on my GSR motor. I got the parts put back together. I was installing the timing belt that I had on the car when I over reved the engine and I noticed a lot of slack in the belt.

I installed the belt and then tighted the spring loaded belt tensioner. Then I turned the crank by hand to get the timing belt to seat properly. Well as I turned the crank, slack would develope and the cams would skip teeth on the belt. I don't know if over reving the engine stretched the belt or if the tensioner spring is shot. I'm not sure and it's the only things that I can think of but the belt looks in great shape and the tensioner pulley and spring also look good and are holding tension. What am I doing wrong? Any input would be helpful. :worthy:
Better to just replace to whole darn thing. Cheaper this way than replacing all the parts that you just replaced because of a bad timing belt and shit. Get the OEM kit, comes with everything you need.
when you replace the timing belt, water pump and tensioner are on teh shopping list.