Nice dude! I just had my SR Plasma Blastoise come back a 10 as well. It is a pop 8 so if you’re looking to pair it I am actually selling mine currently
I remember it was a pop 4 around January. I saw a couple sell recently and decided to send two of mine in. I got a 10 and a 9. I doubt the pop is going to continue to rise past the 10-15 mark just because Plasma Storm is a pretty hard set to grade anyway then add in the 4.5 years that it has been since the set came out.