Have you adjusted the pickup heights?
You typically need to have the "treble side" of the pickup adjusted slightly higher than the "bass side".
You don't want either side so high that the magnetic field of the pickup is "pulling" on the strings or strings hit the poles when strumming though. You may find that lowering the bass side will balance the the output, or conversely, raising the treble side.

Pickup height adjustment is more or less an individual preference and not all pickups react the same but a good place to start is 3mm on the bass side, and 2-2.5mm on the treble side. (then adjust to taste or as needed from there)
When you measure, depress the E strings (one at a time) at the last fret and measure from the bottom of the string to top of the pickup pole piece.


The only other comment I'll make, is that your string alignment is not even. The low E is much closer to the edge of the fretboard than the high E.
You need to slightly loosen the neck screws and pull the headstock "down" the direction of the high E until each string falls evenly from the fretboard edge. Then re-tighten the screws.