Couple points
A very fine touch is needed when snugging up the output screws.
To facilitate this, I run a sharp tap though the soldered in nuts to chase the threads after soldering.. And, I very lightly grease the threads of the screws.
I want the threads clean and very lightly lubricated.
We'd like to think that that outputs are perfectly flat to a thousand inch, but they're not.
So, slowly and evenly snug them down until the siil-pad begins to curl or wrinkle on the protruding edge, then stop,
I get my eyes as close as possible, and use a magnifying headset to precisely do this.
A T-handle is very capable of over tightening the screws and making the outputs even less flat .
A very fine touch is needed.
I cut the tip off a old Phillips screwdriver, drilled and pressed a Allen key shank into the end of it