do you really need new bocks?
or are you just wanting new bocks
If your all cashed up and ready for another investment then go for it
But if you just want to see what or how another stilts performs, then i would prolly say wait a little. You will need a higher spring eventually cause your still growing, so think about that too.
My thoughts are it is your choice, and maybe upgrade weight range like Kiegan before spending big . Just a thought, it made a huge diffence for him