Smittyjones502,
when I first tried using dual amp tones I had the same experience, so, I feel your pain..lol!! Since you are wanting a good SRV tone I thought I’d mention that Stevie Ray ran two cascading Tube screamers into the front of his amp to super saturate the amp input. I can’t tell you how much gain he set the Screamer pedals at or the tone setting he set the Screamers at but
That’s all I know. Good luck in your tone chasing!!