Infentry should NOT cost more becasue this takes places like africa,south america and tinny countrys out of the game giving the guy with the most money a bigger advantage. Infentry should be adjusted into the unit there designed to be and alow them to work in that way.
here are a few
1)raize the defence up +1to +4
2)give them an added bonus when in a city thats higher then the curent bonus
3)Lower there Hit points to reflect how there weeker then other units
Infentry should have LOW hp but the Same as melitia because HP= Health in almost every game on the planet,Use DEF to represnt there differet equipment.
INFO:
Inf VS TANK: on defence-they split up and hide,have better vission, can here the tank comming, prepair a defence,have mines, anti tank rockets,hand granade vs Tanks big gun and smaller anti-infentry gun(mechine gun or whatever the unit is using to get infentry) and heavy armour to render most othe inf. wepons useless.
Tank is good for killing tank and Mec. units but infentry are hard for them without useing the trusty Michine gun(tanks still have them) also hard to hit because they hide from tanks as they would against morters or any artilery piece. Also tanks can't go where infentry go like up cliffs or over revines,rooftops, there still limited by there movement alowing infentry terrain advantage.
In the open infentry lie flat, depoy anti tank type wepons and since the tipical infentry unit is about 50-60 men were the tipical tank unit is about 10-20 tanks there almost even but tanks have mobility armour and range advantages.
Today Tanks are generaly used like mobile artilery VS infentry being tanks are expensive and there range lets them mess up Humvee or transports pinning inf. down. When they do move forward they usualy hide suporting infentry behind them to
give them cover and gain a better field of view alowing better offencive ability. Remeber infentry walking,riding on or behind the tank have guns to kill the pined down infentry there attacking and the tank adds to there mobility as well.
So how to ballance the game? I say make infentry better at defence, lower HP and make tanks weeker at taking on infentry when not acomponyed by infentry. so lowering the def. score of the defenders when tanks+infentry are attacking only infentry and take away some of there bonus.
Another thing to consider is that if the defender also has tanks reinstate the bonus because those tanks are going to nock out alot more tanks when acompanyed by infentry.
But you should also make it so ANY INFENTRY ATTACKED BY TANKS CANT MOVE!
Tanks have a hard time conqureing citys without infentry due to there limited view range and high visability to the infentry.
Tank is great for distroying a building or big target But remember 1 guy running from rooftop to rooftop with a Bazooka will kill alot of tanks and the rubble the tank creates just adds more stuff for the inf. to hide behind.