Overall it looks pretty good. IMO, it's fine that your knees go past your toes since you're a close stance squatter and as long as you don't have any issues. It looks like you get more bounce and squat deeper with the light weights compared to heavier weights. I would suggest to try to keep the amount of bounce and depth identical by getting tighter. You could try pause squats, pausing at the same depth as your heavy sets. That way you won't fail a lift because of an over reliance on speed. However, if you've made great progress with what you're currently doing then you can ignore that advice.
Do you round your back at all when the weight gets heavy? I couldn't really tell from the camera angle.