What position do you front squat in/from?
I've been down the "throw your feet out to get under the bar" route and it's wound up in a mechanical funny with my knee (ligaments went a b it crazy), and the practical way of dealing with it was just to land - very quickly - in a front squat position.
I do that for snatch, too. Watch Andrei Rybakou if you want any inspiration.
The fact that you're not getting "on your heels" is simply because the bar isn't close enough to you (as I'm sure has been pointed out):
- try and keep your heels pinned when you go through the drive phase (Crossfit and others call this the "second pull");
- keep using your lats to pin the bar back. Imagine drawing an exaggerated 'j' with your elbows as you pull the bar off the floor.
- stop pulling with your back.
Admittedly, most of this is kind of bunk for 40/50kg (I'm guessing this is probably close to your technical 50% 1RM based on your other lifts) because you won't get a realistic feel for what the bar is doing as your shoulders/traps will override its normal movement.
I am not going to suggest singles because I have no idea what your technique is like (as it doesn't sound safe, IMHO), but the problem with repping for time is it generally means you can't focus on what is important in these lifts.