Thank you for the replies.

So I was going through the list choosing the styles I wanted to buy (which were quite a few), and all of them were selecting the lowest grade, eg, XT or XA. I took into consideration of why it wasn't selecting T4 or T5 but then I thought, hold on, why is it selecting the grade compatible with the PSR9000 !!! Not even T1 or T2... I thought this wasn't right so I changed all the selections to at least T4, it gave me the warning message about they may not work well on my instrument bla bla but I thought I'm sorry I am not accepting it selecting the lowest grade. So after purchasing and trying them, they all work perfectly fine, all T4 grade. I think I could have even gone T5 or maybe even G1 but I didn't want to push it, T4 is fine since I have a T4 as well to fall back on in case it didn't work out.

So maybe if anybody is going to purchase styles or packs from the store I don't think Yamaha have implemented the compatibility levels properly for the SX series yet, I would say at least T4 or T5 at the minimum. None of the styles used SA2 voices either.