oatmeal cookie question?

Maybe someone with experience baking Oatmeal Cookies can help me out, here.

I'm a fairly experienced baker, but every time I make oatmeal cookies (I've tried a few different recipes), the oatmeal remains too hard and "tough" inside the cookies. The rest of the cookie is just fine (texture, flavor), but the oatmeal stays dry and tough.

I've tried letting the oatmeal soak for a while in the "wet" ingredients, to soften it, but this doesn't seem to make a difference. Is there any other "trick" I can try to get cookies that are a bit easier to chew? FYI, I use regular, old-fasioned rolled-oats oatmeal, NOT the "quick" kind.

Some ideas.

When pre-soaking the oatmeal flakes, use warm (tepid) water instead of cold. You could add a bit of molasses to the water first.

You could also try adding a few drops of white vinegar to the water used for soaking. Use only a small amount. The extra bit of acid may help to soften the oats.

Add raisins. Plump the raisins in warm water before putting them into the dough. This will leave more moisture in the finished cookie.