EHX Small Stone volume drop

So I finally got my hands on a Small Stone (big box NYC reissue with led) and it sounds really lovely, but it has one serious issue - noticeable volume drop when turned on. I have been wondering if anyone of you knows any easy to perform mods to fix the problem. Thanks in advance.

I've done it on a non-true-byapss vintage one I had... my SPDT switch died and I had 3PDTs so I true bypassed it and had to raise the output of the effected signal. I forget exactly what i did, but if you google search I think you'll find various versions of the mod on freestompboxes.org. It changes the sound of the phase tone a bit though, makes it edgier as well as louder. The stock vitnage ones sound great as phasers but suck volume on or off and are a total tone suck in bypass. Very muh a studio tool. This is true of all EHX modualtion and delay circuits from the 70s really.