Which "Main Problems" exactly ? You say on one hand the AI is killing you too easily but then it's too hard to kill it back. If you really need a bit of help while learning to play the game adjust the "Infantry toughness" for you so it's higher than 100% and lower it for the AI until you find it's getting easier with experience then put them back to 100% for both
Don
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"You are never to old to rock and roll if you are too young to die".--- What do you expect to be doing when you are 80?