I am working on installing a new hardwood floor. I have the first few rows down and I am noticing some creaking. This being my first time doing hardwood floor installation, I stopped doing work and decided to ask a professional for help. I had two installers over to take a look and they both seem to think that the issue is the quality of the product that I am using as opposed me doing something incorrectly. The product is 5/8 think 4.75 in wide Taun solid hardwood and the subfloor is OSB. I noticed while installing that there seemed to be a lot of variance in the milling of the tongue and groove.
The solution that I am thinking of is, on top of nailing, adding some glue to the tongue and groove region of the hardwood to help fill in the gaps a little and lock the boards to each other better. The issue that I think this might cause, is when they expand and contract with moisture/temperature changes... it might cause some of the boards to crack/break.
Does anybody have experience with gluing the tongues and grooves of a naildown hardwood floor installation. If this is possible, what kind of glue is used?

Bad idea for a solid hardwood. I can hear already hear all sorts of funky sounds while you're asleep. You'll probably think the house is falling apart. Each board needs to move on it's own.

Is your OSB old and weathered?

No, the house was build in the 80's. The osb is in good shape.