Scampin!!!!!!

hey everyone I have a question in regards to anyone running a similar setup in their a body. I have my 340 with Ceramic coated dougs headers and a mini starter with manual steering.

I started the car up and ran down the block to the local 7-11 real quick she fired right up no problems whatsoever. But unfortunately when I came out and went to start her up I had a very low crank. The battery was just charged days before. Mind you she fired up just prior to the trip to 7-11 with no issues. I think that since it is so tight under by the header/starter that all the heat is doing the starter motor no good at all. I made a heat shield but I don't think it is enough. Has anyone else on the forum had a similar issue? I have a feeling im going to need to buy a better protected starter in regards to the heat. Any comments/suggestions/input is greatly appreciated.