Wheel advice

Alright so i have a question for anyone who can answer. I have a 2017 ram 1500 with a current set up of 20x9 fuel assault wheels, +20 offset and 305/50R20 nitto terra grapplers AT's. Now when i ordered these i did not understand offset so i ordered them and they basically are sucked under the truck. They work fine in the back but up front they rub on the upper busshing for the struts. Thats also with a 2.75 inch leveling kit. Now i put 2 inch spacers and brought them out and it looks alright. However my spacers just took a dump in the rear end and i had to remove the rears. I went ahead and ordered fuel octanes 20x12 with a -44 offset (deep lip) and i intend to stretch my 305's onto them. I dont see that they would rub considering the offset. Would i be correct in that guess? Would those work, without spacers of course?

Did you need two inch spacers to keep them from rubbing? If I did my math correctly, you should gain one inch of clearance with the new wheels. 5.25" backspacing compared to 4.25".

This site disagrees with my math, except it agrees with the one inch difference.

https://www.customwheeloffset.com/tire-wheel-backspacing-offset-calculators