Oof!
Well for my stock suspension P1K5 Basic I went with 5+2 offset all around with a 1" spacer in the rear for width symmetry with the front. 14x7 wheels and 28-10x14 Regulators btw. I can now rotate all tires + spare.
If you want to go that way, by my math you'd need to keep your front spacer and go with a rear 2.5" spacer (1.5" existing lift required + 1") for the rear if you want front/rear tire width symmetry. Check my math. 🤔
ETA - the 4+3 offset will give you an extra 1" clearance over the 5+2, so you're still 1/2" shy if the lift company wants a 1.5" clearance. Since it appears you'd still have to run a 1.5" spacer for lift clearance, I would not want that extra 1" the 4+3 rim gives hanging off there - especially if I was trying for front/rear tire width symmetry. Not good I'd imagine for long term bearing life.
Clear as mud? Hopefully someone smarter than me can verify I've given ya good info.