Mastery Level Ideas

Mastery Levels shouldn't end at 7, instead here's my idea of mastery levels 8-10.

Mastery Level 8: Get 4 S+'s Mastery Level 9: Get 5 Consecutive S's (Can be S-/S/S+) Mastery Level 10: Get 10 Consecutive S's (Only S/S+, no S-)

Level 9 and 10 seem intentionally difficult, but that's because seeing someone with a mastery level 9 or 10 should be insane. Any thoughts?