Deadlift Advice

I've been going ot the gym for a little while, using GZCLP on Perseus.
Been making steady progress (besides a longer dip after a nasty cold) but I still struggle with deadlifts, especially now that they're getting a bit heavier.

1. I got a shit back and inherent anterior pelvic tilt, it's easy to tweak the lower back for me. I put a lot of emphasis on keeping it straight, neutralizing the tilt and bracing the core to support it.
   Still, sometimes I feel the pinch near the sides of the lumba spine. Any advice to help with that would be phenomenal.

2. I got stupid knees. They're not injury prone or anything, but they stick out. Several times now I bruised them pretty severely, mostly on the way down. The bar slides down the quads - as I learned it should - and then bonk into the tissue just above the patella before continuing around the knee.
   What am I doing wrong?

Here's my form at the moment of impact

This is roughly where I hit and bruise