If only you were allowed to to place T4 inside your base where it was safe... I think the kids call it "risk/reward"? I don't play 3s and 4s but I'm fairly certain that most maps are all big enough so that even if you place T4 covering the 1st cap circle outside your base that it's safe enough that if you get pushed back that far then counterplay is fair enough.
And what I suggest simply make punishment less severe.
In the end of the day if the risk is not worth the reward and currently in 4vs4 is not lets offer a discount to OKW that are built in base or even not allow them to be built outside the base.