swole - you sure you aren't thinking of a back squat (with the 'don't push your knees forwards and be sure to sit back with your hips) advice?
the aim of the front squat (if you plan on cleaning with it) is to have as upright a torso as possible so you don't lose the weight forwards when you catch a clean in the rack.
ideally you want your midfoot, your hips, the bar in as much of a vertical alignment as possible. your knees will trek forwards from your toes as much as is needed to keep your hips as far forwards under the bar as possible. that will be more for longer lifters.
the heel plates help shift your balance forwards slightly so you are balanced even with your hips back a bit behind your midfoot. they stop you falling on your ass. i suspect your knees would need to come forwards even more without the heel plates? if you try and squat without them what prevents your descent? ankle dorsiflexion? or do you need to do a bit more work on opening your hips?
are you wearing Olympic Weightlifting shoes (with a raised heel) or do you need to get some?
looking pretty good to me, though.