The only split rings I use right now are Owner Hyperwire split rings.  Owner has stepped up to the plate and manufactured a super strong split ring that does not develop a gap when you slide it on over a large eyelet.  I will not fish a bait unless it has these split rings on it.  If for some reason you don't use these split rings (a bad idea) the next best option is a heavy duty split ring, one denoted with an H next to the size, like 5H.  The only problem with these is that they will sometimes develop a gap in them, and I've seen it where a heavy split ring has slipped off a narrow guage eyelet while fighting a big bass.  Just go online or go to your local shop and buy Hyperwires and replace everything you have.  You'll never have to think about it again.

I fish snaps on many of my hardbaits, and snaps are a potential failure point with heavy line.  I'd recommend a 65lb cross lock snap for your swimbait fishing.  When in doubt, go up a size on the snap.  And always give it a good pull once you have your bait tied on just to be sure the snap isn't a dud. 

When rigging trailer hooks or trap rigs, there are three general methods.  Coated wire with crimps, braided line, and heavy monofilament.  Each will work when done correctly so its not so important which method you use, but doing it correctly IS important.  The only way to learn is to either have someone show you a proven method, or test your own rigging to make sure it does not fail.  I myself am a coated wire guy.  I use 60lb Sevenstrand coated wire and I crimp it.  I have friends who use 80lb braid and tie it with a Trilene knot and super glue it, and I have friends who either tie 40lb mono with palomars or use 100lb mono with crimps.  Whatever method you choose, rig up your hooks and then pull as hard as you can on it to see if it fails.  25lb mono may seem strong, but when you only have two inches of line, there is no stretch and it can break very easily.  I would never under any circumstances use anything lighter than 40lb test mono for short stinger hook connections. 

Let me just say it one more time, do not skimp on terminal tackle!