The biggest grapple right now is Predestination, and Eternal Security or the possibility of losing salvation.
I figured it was the eternal security/loss of salvation thing. I don't give Predestination a second thought so I can't help you with that, but on the OSAS thing, I have plenty to say...you've probably read most of it in other threads.
Some seem to think the 2 different views make no difference to our salvation but how wrong they are. It's as serious an issue as Heaven and Hell. Those that teach that have no business doing so, because if they are wrong, and I'm certain they are, they could easily be the cause for someone heading down the wide road to Hell.
Actually, if you have read the scripture about the "narrow way" and the "wide road", just that tells you OSAS isn't true because believing one can be saved even if they live in sin, completely does away with the "narrow way" and makes the "wide road" the way, when we all know that is the opposite of what it truly is. It make the narrow way scripture naught, and anything that disagrees with the plain truth of the bible, and in this case a specific verse, simply cannot be fact.
All I can recommend is you watch the arguments carefully on the threads that are covering it. those threads happen often because they themselves are not certain it's a fact so they keep coming back/starting threads in order to get reinforcement from whoever will agree with them. Watch those threads and see how often the OSAS crowd stops answering questions, or refuses to comment on the points that refute it. IOW, see the signs they are wrong. I've seen their arguments fall flat so often, just for that reason alone I've no doubt in my mind OSAS is a lie.
On another thread we are commenting on the unforgivable sin, and just like OSAS, people don't want the biblical truth to be fact because it's somewhat hard for them to take or holds them back/hurts them in some way, so they built a whole religion around changing the truth. And as is often the case, selfishness is at the bottom of the problem.
Because of that selfishness, they do all they can to put others at the risk I mentioned earlier, even if it ends some up in hell...now that's selfishness at it's worse.
Just as you are doing now, "Seek and ye shall find", is probably one of the best suggestions I can give at this stage of your search.