Secondary Abillity strengths

[ChiePet]

We all know how many Main abillities it takes to get what out of it, but roughly how many secondary abillities stacked does it take to replicate a Main one?

My guess is 3x, but being just shy of it fully meeting main. (ex; if main was 45%, 3x Secondary would be about 44.4%)

Appreciate your input!

 

[Phobos]

The guide states that 3x sub is equivalent to 1x main, and this is more or less the case - I believe there are a few abilities for which 3x sub is worth fractionally more/less than 1x main. Extensive info here.