Ever considered updating to 7.6 or 7.72? Just to try? Then a lot more players would use mana shield and people's UEs wouldn't be a problem (Or maybe just increasing mana given by MF). Also, lowering field damage is a good idea, 'cause the only two things they're used for is A] senseless spamming by noobs and B] trapping (and well C] sneaky frags by Worr =p). So damage from them is not really vital to gameplay imo