Should we be assuming that everything involved in this scales linearly? That's there's no synergies or efficiencies of scale at play, that the effects of magic are always entirely linear with the amount of power applied, that there's no beneficial feedback loops that were made use of? That no other variables have changed in the last eight thousand years?
One of the reason why we assume linear everything is that it makes speculation easier, the generic 'all other things being equal'.
But this does bring up a thought, what if all other things aren't equal? If we assume that the Karaz Ankor network without Vlag and Dun or Eight Peaks was much weaker than it was with either that would imply that if you add both it should have gone much higher assuming whatever synergy made that jump keeps going (which of course it may not, but it would be an odd coincidence for two discontinuities to exist so close to one another). What does this mean? Well for one Thorgrim could have much more power than he actually used to start up the Eyes and he's using most of the extra power to charge the 'batteries' or on a more somber note there simply aren't any more wonders for him to turn on beyond the Gas Forges which would be a waste to run without the air ships to service.
Just to be clear Boney, the above is no no way aimed at getting confirmation from you, just some speculation to pass the time with and see what other thread participants think of.