I've tweaked my Deco Amp and got the tone control and gain just right, but when I turn the gain up, I get a really harsh top end. Very brittle. I thought I'd add a .002 "fizz cap" on V2 from the plate to cathode, which rolled off the highs just a tad, but even then, I'm still getting a harshness on the top. Too edgy. I'm wondering if I need to raise my grid stop resistors? Right now I've got 47K on V1, a 30K on V2 and the 6L6. I've even got a 1k on the screen (Merlin's idea). V1 and V2 are both 6SF5s. Thoughts?