I'm thinking... siege server need something more that changes in rotation to give us fresh news, so I suggest "clean" server of "not so good maps" (move from rotation only) that causes low fps for many players (and are too big also), and let some space for some other maps waiting to be in rotation (we don't want more than 50-55 maps in rotation).
Also doing this, maps won't be deleted from server, so if any want play in some moment any of this maps will be possible too, by asking admins and if players supports idea.
For help, I would like you post some names of maps that you think have this troubles or are too hard to get a good balance, thanks.
ps: Tartstone was moved already, and this Wine Castle will be too (Tartstone causes low fps, and I agree that Wine is a hard+not enough balanced map).