Yes the current rules package for this type racing isn't friendly to equipment.
When you buy a high end 6500 ,7200 or other high end Lipo and it doesn't hold up well in this type racing this means no packs can handle it.
I have a customer who is up to 350+ cycles in 1/8th scale with our 4S-6500. I'm sure this wouldn't be possible with the 2S-6500 in your application.
Maybe someone at ROAR can make modified a real open class so if you feel like running 3 ,4 ,5 or 6S you can in the end the best driver with the best setup will win regardless of the pack he's using.