I don't think you are really giving enough information to answer your question. That said, in general, if you are looking to increase strength for athletic rather than aesthetic reasons, I would strongly recomend a periodized weight program - I think this is essential, and it's why I can't answer your question.
What phase of lifting are you in/how long have you been in the gym? If you are a couple of weeks into a weight program, you probably shouldn't be doing max weight/low rep workouts. Ditto if you are putting in a ton of miles in other pursuits.
Roughly speaking, my weight training breaks down into 4 phases:
Adaptation/Hypertrophy (only 2-3 weeks long): 4 sets, 25 reps, moderate weight (squats in this phase peak at around 210lbs for me - I weigh 142lbs right now)
Basic strength(4 wks): Fewer reps, higher weight. 4 sets, 8-15 reps. (squats @300lbs for me)
Power or peak phase (3-4 weeks): max weight, explosive fast reps (5-8,) 3-4 sets. (Free squats up to 450lbs, hack squats around 900 for me)
Muscular endurance (3-4 weeks, although I usually have to cut this phase short to start racing...)
Light weights, reps to failure done VERY explosively. Some plyo work.
If you can follow some sort of plan like this, I guarantee you will get the squats up to where you want them - I did. Year to year, the improvement, if you track it, is pretty remarkable.
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