G30 Issues

3-4 times per magazine means something specific is wrong. Glocks should shoot anything (except reloads) near flawlessly. Did you buy this gun new or used? If new and you only have 750 rounds through it, I find it hard to believe there is a problem with the weapon. Are you using higher power premium ammo (+p)? If so you could be limp-wristing and the higher power ammo is masking the problem, which shows up when you use range ammo. Glocks are very touchy with limp wrists.
However, if you suspect a mechanical problem, here's what I would check, in order of probability of causing the issue. However, I find all of this unlikely with only 750 rounds through the gun.
My first thought would be worn magazine springs. That will cause 80% of all FTFs in a Glock. While I find it statistically improbable that the same problem would occur with all your magazines (it's usually one problem mag), it's possible if they were rotated consistently. But this would only be after 1000s of rounds, not 750.
Next thought: how often have you cleaned your magazines? Dirty mags will cause the other 20% of FTFs. Break them down and give them a good scrubbing - especially the followers. Again, 750 rounds, even through one mag is not what I would consider “dirty”, unless you were using Aguila…
Next, inspect your extractor. It might be chipped or worn. If your gunsmith wasn't a Glock armorer, he might not have know what to look for. If such a small amount of rounds it’s more likely it got chipped. Ever shoot steel casings?
Next, take a close look at your recoil spring assembly. Make sure the rod is intact and the springs look good.
Next, try pushing back and forth on the extractor. If it feels solid and gives good tension, skip this step. Otherwise, if you know how to do it, break down your slide and inspect the depressor plunger spring - it could be worn or broken causing your extractor to malfunction.
Lastly, and least likely, lock you slide back and look at the ejector. Make sure it's not bent, or broken.
That's all I can think of for mechanical issues.
As far as accuracy: define "trouble with its accuracy".

My first thought would be worn magazine springs.

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Mine, too, if the rounds are nose-diving into the feed ramp. Cramming ten large-diameter, heavy cartridges into that small space and then pushing them up fast enough to be stripped off during firing is a pretty tall order for that spring.

What's your shooting history? I'm just wondering if you are a little new to shooting and need to have someone show you a better grip? Definitely sounds like limp wristing. You probably have a better grip on the 1911 than you do on your glock. Are you using the longer mags or the flush base mags? A .45 ACP in a short grip might just be too much to hold onto for your grip. Go to www.springerprecision.com and click on "shooting tips" at the top there is a good article and some videos about proper shooting grip that really helped me when I was learning. If you're not new to shooting then I would send the gun to glock and let them look at it.

Continuous FTE problems with a Glock? I am not convinced of this. Why is it that the only time I get info on Glocks failing is from the internet. I've never seen one fail in real time. Never.