muscle ups have a lot to do with technique. With your strength values you should be able to do this, especially because I think the 8sec Frontlever is definitely more difficult.
I would therefore guess that it is much more about technique and execution than about strength. For example, I can't hold the frontlever fully stretched on the rings for 8 seconds, but I can make you 8 clean muscle ups on the rings.
Yeah the technique definitely plays a big part @booster916, I still haven't perfected the false grip so that 's holding me back a bit. I get to the transition and I'm slipping from a false grip to a finger grip. I'm not sure if it's the rings I'm using (they are a thicker section than normal) or if I just need more practice.
I can do fast muscle ups on the rings but I'm focusing on slowing it down to get a slow one for now.