I think you just proved that this change will work. Those 20K fewer fights that you had will be 20K that other guilds might be able to use. I don't think that very many guilds will feel sympathy that you are "only" getting 45K fights.
I think your analysis is one-sided. It assumes those Guilds are willing to fight for sectors instead of being handed to them.
I don't like to use GVG comparison, but no one is going to give you any sympathy for not fighting and competing.
I have never seen a track race where the faster sprinters have to slow down or tie weights to their limbs to give the weaker runners a chance to win.
It's a dog eat dog world and the weaker Guilds need to go big or go home.
They need to cultivate their cities and position themselves to compete, not given a handicap like in Golf.
This balancing could be accomplished much better by competition among peer Guilds.
It is not fair to anyone matching a strong Guild with a bunch of lighter ones.