Others might chime in. I don't believe there is a "standard" ratio to the "estimative" index method. Rotala Butterfly Calc is pretty good to go by. I'd say choose a ratio and stick with it for now. See how your plants start responding to it and make changes to your mix if necessary. It will take weeks to months before you may feel the need to change the ration. Good luck!
Also, just some advice, wait for responses to your other posts before reposting essentially the same question several times over.