What standard of accuracy are you looking for? It makes a difference. If you're shooting bugholes with the first three and cloverleafs with the last two at 100 yards, you may not have the problem you think you do. If you're shooting 1.5" with the first three and 3" with the last two, your problem may not be your rifles.

I'll try to word this as gently as I can. Many of us grew up with a parent who was drilled in the "8 steady hold factors" - and who in turn drilled them into us. Some of us had further encouragement from loud people wearing Smokey Bear hats who further seared those factors into our brains.

As I drift around the gun counters and at the range lately, I'm concerned that I run into too many shooters who seem to be well-read, but poorly-practiced. They can tell you all the virtues of the latest cartridge or reticle, but can't hit the broad side of a barn. Some of the guys behind the gun counter are the worst offenders. Too much media and marketing exposure, too little marksmanship training.

You may or may not fall into the above. What's working with the first three rifles that isn't working with the last two? Specifically? What tells you that the last two aren't working? Is the quality of the optics and mounts similar? Were they correctly installed? The only one of the rifles you mention that I own is the Vanguard. It won't win any prize past 600 yards, but it does reliably kill elk in the field at ranges less than that.