Personally I think you need to look at this as you would trying to call in any animal. Why should they come in to your call, should be your primary question. What is the hand squealer going to imitate; I presume a pig being attacked. So what will pigs reaction be? They will simply move away, as it is safer, rather than heading into danger. For pigs to react to that call, in the manner you want them to, they would have to be on top of you already. Think about it like calling elk, if you rip a challenge call and are not in immediate proximity of the bull you are working, he has no need to move into a situation that jeopardizes his control over his girls. The situation is pretty close to the same with the squealer.
If you want to get close to elk, you start by utilizing calls that put them at ease; on your list of 5, you have only one call that is good at that. It is a content feeding call, with social grunts thrown in. Use this one, even if they bust you (not 100%), they are still likely to go back to feeding, assuming they were feeding.
You likely have a piglets feeding craze on that call, I would stay away from it, as mature pigs are not likely to come into a sounder of piglets. Same for the boars fighting, it will only chase other pigs away.
In short, that content feeding will put pigs at ease to the point of them continuing with what their routine was. If that was coming in your direction, then they are likely to do just that. It will also help in you moving in on them, if you don't forget everything else.
But if you want to bring pigs in, from my experience there is only one tried and true method, use their noses to bring them in, i.e., bait them. Unhusked peanuts works very well, salted or unsalted, whichever you prefer. Spread them out and let the wind do the work. If they hold up, use that content feeding call, and sit back, but ready for them. Or just sit off a known regularly utilized trail, down wind and wait.
Save the hand squealer for predators.
Best of luck!