TW Matchmaking needs to be fixed

Today, we have a 39 slot war vs these guys.  Can you please enlighten me as to why we should even try?  All these big guilds are sandbagging because they cant hack it against guilds their own size and we get punished.  We have had no less than 6 of these massive 100+M sandbags this year.  Why is it so hard to switch the matchmaking to look at guild GP and not joined GP?  Make these large guilds fight against guilds their own size.  Not doing so ruins this game mode for guilds like ours that do very well in TW when not getting dunked on by guilds we have no business matching up against.