I've got Ezzy Lions 6.5 & 7.5 year 2020 as well, same colours.

I had the 2016 sails as well. My 430 Unifiber mast felt a little too soft, so I tried the 460 Ezzy RDM in it to see what it was like. As you have found, it had a lot of belly. You can add a bit more outhaul. I found the sail powerful, but when a big gust hit it didnt twist off and spill the wind enough. It made sailing it a bit more physical. I later rigged it on a friend's 430 Tushingham and Duotone mast and it set as it should. So I bought an Ezzy 430 RDM.
I am 77kg, so if you a lot heavier you might appreciate the extra power and sailing it in stronger winds than I did it might twist off enough.
I would expect the 2020 sails to behave in the same way as the 2016 sails in this respect.

Yes, I used the longer headcap supplied in the bag.