1965 Dart front disc brake conversion low brake pedal

So I had a shop install the Dr Diff front disc brake kit. I had a cast iron disc/drum brake master cylinder laying around that I bought in error when I replaced the single pot master cylinder a couple years ago so I had them install that. Also installed the correct proportioning valve.

Everything works. It brakes well, with nice pedal feel. I think the pedal is too low when depressed. The pedal arm sits about an inch off the carpet when fully depressed.

When I got it home from the shop, I noticed the brake lights were out. Turns out the brake pedal was a couple cm forward than when I brought it in so it wasn't making contact with the stop light switch. I adjusted the switch.

The other problem is when I tested braking on gravel the rear drums seem to lock up slightly before the front discs. I want to test this on wet pavement to make sure.

I didn't replace the brake master cylinder push rod. It still has the stock rod. Maybe this is why the pedal arm was a couple cm forward from the original position? Should I replace the rod with an adjustable? Could this cause the rear brakes engaging before the fronts?

If so what rod do people suggest? If not what should I do to chase down these two issues.