Basically everything Felix said. Haven't actually played with him, but judging by the post we have a similar piking style.
Though, I generally deal with other pikeman differently. I'm not very good at judging my length, so I generally play defensively for the first hit, and then try and chamber block them into a thrust stun. If I can't get them after a couple attempts, I may pull out my sidearm in an attempt to end the fight sooner so I can get back to helping my allies. Even a bad pikeman can occasionally judge his distance better than the best pikeman, but he doesn't have a chance in hell of performing a proper helicopter by luck.
Heavier, durable pikeman is, imo, the way to go. With a build like that, utilizing heavier armor, you won't die nearly as easily if someone manages to get through your allies and thrust stuns you (which, even with the best allies, WILL happen from time to time.), and you'll be able to deal a lot more damage. The big disadvantage of it is, of course, you aren't as mobile, so it can be a little harder to target swap. Though if you use that 300 length properly, you can still target swap with relative ease.
On the other hand, NH_Relit manages to do exceedingly well with a higher agi build.
To the OP:
You mention that you have bad ping, so some of the really nice tactics such as watching for an opponent to open up, as Felix mentioned, won't really work for you. HOWEVER, you can still be very effective. With proper footwork and foresight, you should even be able to perform perfect helicopters.
My advise to you to deal with your ping, is to learn to use footwork to FORCE your opponent into doing what you want him to do. Learn to take control of the fight, don't let him push you around and back you into a corner. Back-peddling will get you nowhere without allies around. If you know what your opponent is going to do before he does, you won't need to worry about ping as much. The way you do this is all through footwork. For example, if you run directly to the right to get past him, you KNOW he's going to try a left swing, and so you can block it without even trying.
As counter intuitive as it may seem, I think you'll be better off using an aggressive footwork style as opposed to a defensive one to counter bad ping.
And to Felix:
Actually if you don't mind, I'd like to just toss this in the Guide as-is, it's quite good.