Hey there, I have a set of Mizuno MP-20 blades - they are sweet to hit. Made the mistake of giving them to my young son to try, expecting him to struggle with blades, but it backfired and he doesn’t want to give them back. I’m looking at second hand sets for me so that he can keep them, and need the senior graphite shafts. What of the newer models are most similar to MP-20? I’d really appreciate your help as I’m finding it a bit confusing and Mizuno isn’t a brand I’m familiar with. Thank you