Deadlift: Worked on my gaze - hope it is better now
Side Angle: Update Deadlift 4.8. - Side Angle - YouTube
Front Angle: Update Deadlift 4.8. - Front Angle - YouTube

Squat: Yeah I felt it the day afterwards - my back does not like to be arched that way. I actually tried to really brace my core (as being punched in the gut) but somehow I loose it during the lift. I googled a bit and found something called "90-90 breathing" which might help building the necessary core stability. I will give it a try and lower the weight until I get my back straight enough.