Try some gz34 rectifier tubes. Not sure how many you need in the roadster. If its dual im guessing two gz34's. They really tightend mine up. No more sag on the low end
Def need a switcher. I have a delay and run it in the fx loop. I just tap the fx button to activate my delay when i need it.Hard to do tap tempo though. Thats why all my delays are preset in order according to my set.