Hey everyone, I just got a new Ibanez Genisis RG550 and also picked up some Gravity Storm pickups. I kept the original middle pick and wired the guitar this way.

Gravity Storm pickups: black + white wires taped together, red to correct positions on the switch.
Left the middle pickup wired as it was from the factory.

My issue seems to be that when you switch to positions 2 & 4 the pickups sound thin and aren't usable at all.
Position 2 should be bridge + middle
Position 4 should be neck + middle

I used this diagram.

https://d2emr0qhzqfj88.cloudfront.net/s3fs-public/diagrams/RG270%2C350-3hb.pdf

Can anyone tell me what could be wrong? The neck, bridge and middle all sound fine on their own. Could the cap on the volume pot be causing this?