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Nice restauration and playing! Concerning the volume rise...my guess: it's a faulty powertube or a dirty tube socket... Since you're playing in class A mode, you're only using the outer 2 tubes so you can troublehoot by swapping tubes but be aware that the outer tubes aren't EL34's, if they...

I have been searching for the original Mesa Boogie Mark IVa manual in a decent format for ages but I couldn't find it so I decided to create it from scratch using my original printed manual. The OCR software presented it in a sligtly upgraded 'Courier New font' so it's not 100% correct. However...

I've been using a Mesa Quad with a Marshall EL34 50/50 for some time now and it just sounds nothing short of magical. The EL34 replaced a Mesa fiftty/fifty and prior to making the swap, i've compared both poweramps and the EL34 matched the Quad a lot better but YMMV. The fifty/fifty on it's own...