I run my PSA DSD through my VTL 7.5iii preamp. It sounds miles better than directly from DAC to amp. Cannot spoeak to your preamp talents. Try both.
I have used digital from the first CDP - the Magnavox CDP 650 -- since around 1986, and have had CDP's and numerous DAC's throughout. The PSA DSD is a first rate, top-of-the-line DAC, not least of which included the free upgrades from PSA. I have not been moved to look into a newer DAC in a few years, especially when I installed the Bridge II as a streamer. It all sounds glorious and functions very well. The Shunyata Sigma IC's were the topping on the cake running from DAC to pre and pre to amp. Neal