Nevermind, I think I found the answer to this
Seems I need to figure out if there is a feedback resistor used on the opamps and if in fact it is a feedback resistor or what depending on what pins of the opamps it is connected, and those would have to be replaced with a different resistance directly proportional to the one thats in there

I am told for example if its a 10,000 ohm resistor then for a 30% difference you need to add or subtract about 3000 or 3500 ohms? I don't remember if going up in resistance would bring down the output or going down in resistance would bring it down in the example I was told? I am assuming going up in resistance would bring it down, but the guy maybe told me not thinking that going to a 5000 ohm would be cutting it in half.

I am told for example if its a 10,000 ohm resistor then for a 30% difference you need to add or subtract about 3000 or 3500 ohms? I don't remember if going up in resistance would bring down the output or going down in resistance would bring it down in the example I was told? I am assuming going up in resistance would bring it down, but the guy maybe told me not thinking that going to a 5000 ohm would be cutting it in half.