I have this exact problem. I also have the dxd southbend stage 4, with the heavy duty csc. When I first put it in, my master cylinder failed, so I had it replaced. Since then, I have te same symptoms that you're describing- its very hard to engage into 1st and reverse from a stop. I usually have to put it into another gear before putting it in first. My shop doesn't know what it could be, and I don't want to drop the transmission if I don't have to.
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540whp @ 10.5 psi 
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