question regarding deadlift and squats

[ph0bia.]

I have lower back pain at the moment. I want to know if I should de-load, rest for a while or continue with it?

I'll post my routine and maybe you guys can suggest something. The back problem has started just recently and I've tried using a belt, it's helped but not completely.

I'm following a split which looks something like this:

Chest & Biceps
Back & Cardio
Cardio
Shoulders
Legs
Rest
Cardio

Back exercises include:

Front pulldown (3x12)
Bent-over row (3x12)
Dumbell bent-over row (3x12)
Seated high row (3x12)
Cable seated row (3x12)
Deadlift (4x12) - 20 kgs (excluding the bar)

Legs:
Seated leg curl - 3x12
Back squats - 5 sets (weights are excluding the bar)
1x12 - 10 kgs
1x12 - 20 kgs
1x12 - 30 kgs
1x6-8 - 40 kgs
1x6-8 - 40 kgs
Hack squat - 3x12
Leg press - 3x12
Leg extension - 3x12
Donkey Calf Raise - 3x12

I concentrate more on the deadlift and the squats on these two particular days and they exhaust me the most. Should I:

1. de-load on these two exercises?
2. keep the same weight and try reaching 12 reps on the last set?
3. go heavy on deadlift and squats every alternate week? (week 1: heavy squats/week 2: heavy deadlifts)

Thanks.

P.S: the exercises listed are the exactly in the order I do them