First bit of advice would be to upgrade your computer with a shift key...
Next, more details about your program would be helpful here. Are you doing the One True Religion, AKA 5/3/1, or something else? I'm guessing the answer is no because of the fact that you're squatting twice/week.
I find that if I do one heavy day of DLs and one heavy day of squats per week I'm walking around with sore legs most of the time, so adding in another set wouldn't really buy me anything.
Also, I find that the Boring But Big assistance work seems to help with these lifts, as you mix up a small set of heavy lifts with a larger set of somewhat lighter lifts, giving you the best of both worlds.
By way of comparison, I weigh 220lbs, am 46 years old, and can squat and deadlift ~300lbs for 2-4 reps; this is after roughly a year of training. In my case I've been able to consistently increase these lifts with few problems, but have been having real trouble moving my military press upwards.