lower leaves turning purple-brown

[Rusty Trichome]

was that an actual rootbound?

Yup.

should i pinch the roots while transplanting or should i leave them alone?

Pinch the roots...? During a transplant you massage the rootball a tad to get some of the root tips to pop-out of the rootball and find the fresh soil, if that's what you mean.

does the roots usualy show indication for overfertilization or does the signs only seen in the leaves?
was transplanting the right thing to do?

Roots should be a healthy white, and hopefully not too tightly packed. Troubled roots are a tan, brown or black. A bit late in the cycle, but the transplant was looking necessary.
Roots rolling-around the bottom of the pot shows it's looking to find some fresh (healthy) soil.

10 hours after transplanting the plant still looked the same - i expected it to be happy for me after a night in the wet soil but it still looked sad like after 5 days with out watering - was that possibly because of the shock caused by transplanting or messing with its roots?

Rarely does something good happen overnight. Yes, she will go through transpant shock, but if you treated her gently, she should be fine. Usually takes a few days to recover. Old leaves are old news though...don't expect the damaged leaves to heal. Keep an eye on the new growth to monitor results.

Farmer: although yellowing is fine for late-stage flowering, did you look at his pix? That's not a normal appearance regardless of what stage she's in.