Currently servers get extremely stacked. Multiple tanks, attack helicopters and jets on a single team with other teams not being able to get anything up as its impossible to figh against multiple jets and y32's who can get cover from tigrises.
I believe there should be, additionally to the Tank, Heli and Jet parity, a parity which includes all 3 of these To make it impossible to have an unbeatable stack. For example if you have 3 jets already (without the enemies having anything) you should not be able to also buy another y32 and tanks to enable the other teams to retaliate. Furthermore, i believe Tigrises and cheetahs should either be added to the tank parity or get a new parity of their own.