Need Help with Amp Preamp Gain Matching/Staging

I've read a few things about amp preamp gain staging, but I still can't wrap my head around what I should be shooting for. The amp in question is a Parasound A21 and the pre a CODA CLX (specs for both attached), using the balanced connections. Right now, I have the gain controls on the A21 all the way clockwise and either leave the CLX at unity gain or add about 6dB when using one of my turntables (the cart is on the lowish output side and the phono amp doesn't have any provision for adjusting gain). Other than with this one table, this ends up with me having the CLX volume set at between 75 (for CD source) and 85 (for tape or phono).

A21 Specs.jpgCoda Specs.jpg