This is the heaviest I've squatted before. 225 3 times, about 90% of my training max. This next cycle I'll be going up to 235 and will try and form check again. Honestly, I don't even know if I squat high bar, low bar, or doing some kind of hybrid variation. I think I tried low bar when I first started lifting, but was having trouble due to shoulder mobility and ended up doing a squat that felt comfortable (no idea what the end result was lol). I try to get my ass as low as I can with each weight, but I notice with heavier weight I have more trouble getting lower which I attribute to tight hamstrings (they are naturally short) and tight hip flexors. Either way, any advice is much appreciated. I've been trying to concentrate on keeping my upper body tight and driving my hip up out of the hole. It can be hard with the heavier weight to come out of the hole and I am concerned about whether I was GM'ing the weight or not. My knee buckles in the 2nd or 3rd rep so I already know I have to concentrate on forcing my knees out, but I'm not sure what else I did wrong.