Preparing for Alpha Dragon fight.

Hey everyone,

I wanted to ask a question in regards to my preparation to face the dragon. I have beaten Alpha brood and alpha pithecus but am now facing down the alpha dragon. I have got theris breeding and currently have a male with 40 points into melee (20 mutations) and have begun on hp with currently 20 points (10 mutations). If I was to stop here what level of saddle would I need to be pretty certain of victory.

I am playing on single player on the PS5. I know to not pump the hp above 21k as veggie cakes can heal a max of that. I will give 10 cakes to each theri before I enter the arena.

I really don't want to have to grind out the saddles multiple times so getting the win first time is my priority so if needs be I can keep going. Furthermore, could I use these theris against the overseer or is it better to start on rex mutations?