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Even 4' is pretty short assuming it's 3/16" ID tubing. I'm surprised you're getting a good pour.
Generally speaking, it's a formula between line inner diameter and line length to reduce foaming. That being said, I've seen people with shorty picnic taps (some probably only a foot) that work fine in a pinch.
Those require dispensing at low pressure or the addition of restricters in the beer side dip tube. They are handy.Epoxy mixer restricter hack. - http://myadventuresinbrewing.blogspot.com/2009/07/too-much-foam.html?m=1
Slightly tangential , does any one make a picnic tap that actually works? The ones that came with my air keg set will not seal even at four psi. At about half a glass you start fiddling with them to stop the flow. Ten days to ordering Perlicks.