Nowhere in any post did you say that. We are not mind readers. And even now the clarification you offer is not helpful.
Optimal size can vary. There is no “optimal” size for your rims without all the other info. Diameter is a biggie for clearance radially and tire width can vary quite a bit for a tire designed to go on the rim’s you specified. We are not making this hard for fun, it IS hard to change tire and wheel size to other than a factory size.
As an example, I put 18x10 rims on my Mustang with 285/35/18 tires. A size not offered from the factory. I measured a bunch and researched forums until I was satisfied the combo would fit. It did, perfectly because I understood what all the numbers meant and made a tire template to verify clearance.
Your best bet, at this point, is to go back to the forum and ask what size tires others have put on their similar year 330’s that fit without rubbing.