Without seeing you lift I would think you have 2 probable major issues. First would be your squat and deadlift technique, and to a lesser degree your bench technique. Second would be you probably have some serious muscle weaknesses.
Instead of DE days, you could do a sort of technique day. Do very light weight and focus on technique. On one day do this for squats and deadlifts, the other do this for bench. I like doing box squats even for beginners because I feel it teaches them proper technique and they don't have to worry about getting deep enough. Start with the box at a height that you don't drop onto it and gradually lower the box until you are at or below parallel. Again, the focus should be completely on technique. Once your technique gets better start increasing the speed.
On your max days I like doing a variety of exercises and constantly trying to pr them. As a beginner, you should be making big progress for a while. I feel that if you just try to squat, deadlift and bench every week and try to set PR's on them, you will stall quickly. I don't suggest doing bands or chains yet, but try different max exercises and try to PR them always. If you can't, no big deal, but try. Here is a list of some exercises for each lift you can do on ME days.
Squat lifts: Free Squat, Box Squat (vary box height), Safety Squat Bar Squat (if you have it), Good Mornings of all kinds (do 3RM or 5RM on these)
Deadlift Lifts: Deadlift, Deadlift off Box (2", 4"), Good Mornings (same way as squat day)
Bench Lifts: Bench, Floor Press, Board Presses (all kinds)
When you get stronger add chains and bands to these exercises. The rest of your lifts should hit the backside of your body (Upper back, Lats, Triceps, Shoulders on bench days. Lower back, Glutes, Hamstrings, Abs on leg days.) and should be done with the goal of putting on mass. For most people this means higher reps of relatively heavy weight. Also, try to vary these exercises from workout to workout.
This is pretty much a Westside template. I started powerlifting 9 months ago and was at 170lbs and tried the basic bench, squat and deadlift all the time method. I made improvement then quickly stalled. I was fortunate enough to meet a couple of good training partners and I started doing what I have outlined above. In the 6 months I have been training with them I have increased my weight to 190lbs and increased my total more than 200 pounds and have constantly made PR's. As a beginner gains should be easy if you just keep the body guessing.