What’s the Right Power Amp Ratio For Bi-Amping?

From what I understand the total out put gain needs to beof equal value or very close. If not the under powered will be drowned out. 

Why vertical bi-amp? You don't need the same power for the highs as you do for the lows. Horizontal bi-amping is much better because the low frequencies are not robbing power supply current from the high frequencies. The actual ratio depends on the efficiency of the drivers. Are you still going to use the internal speaker crossovers? With or without an external active crossover? Multi-amping has been in my blood for 44 years. 

I am using the horizontal bi amp method. Like you said all the low end is being supplied by my ss amp and top end by the tubes.I keep the tubes in ultra linear mode and it sounds fantastic.  Not using an external cross over.