[SeaEagle]

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If you would bet all hands on all streets and he would continue only with a pocket pair or sometimes AKo postflop and fold those PP’s as soon as an A or K turns or rivers he is probably playing perfect against your strategy of always betting.

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If your TAG is this straightforward, then you have a pretty easy time against him. You should always bet the flop and, since he'll only continue with hands that beat/tie your Ax, you should always check the turn UI, and you should almost always fold the river UI if bet at, since you can only hope to occasionaly chop with his AK.

In short, and I think this echos W.D.'s comments, if your opponent is completely predictable then it's pretty easy to play perfect against him. I think your question probably assumes that he doesn't play completely predictable - that when he calls your flop bet it doesn't always mean that he has AK or better. Once your opponent starts mixing it up a bit then you have to start mixing it up a bit too (and that's when poker gets more interesting).