The KT doesn't normally ever come out at 17 minutes because it implies your converting to fuel AND the Ostheer player has wasted all his MP on fuel caches.
Really it's a non issue, making call in's dependent on tiers has been the go to answer to fixing the call in meta for a while now, the KT is just a good example of how it can be done while remaining balanced.
otoh your insistence that 17 minute KT's are viable because it means 17 minutes with no armor support AND no Ostheer support/teching is somewhat suspect.
Try rush KT in 4v4 with 1-2 cache and muni-fuel after getting 2 schrecks.
KT will arrive at 17min if you have good team so you wont be pushed back very hard.