I had success today. I printed on wood and used a clip light behind and one in front to create heat. I set the bed to 80C and the wood did heat up to that temperature. I surrounded them with foamcor to create an envelope and my 4"x3" part printed perfectly. I've had 5 failures with the same part using different substrates and techniques.

I hope to repeat the success so that I know I have a technique instead of a happy accident. It's a 7 hour print and most of the warps don't start until it's over 1/2 way done so it's been frustrating. But for now I'm thrilled. I can't wait to use up this 618 Nylon as I've ordered some Nylon Bridge per Jim's suggestion. It should make life much easier.

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