I tried "-a scrypt" at MPH, and it still wasn't accepting my shares. So, I don't know if I had something else wrong, too. I also checked out zpool, and it seems that zpool only pays out in BTC, while I'm looking to mine and directly collect Verge.
However, I then looked around for more x17 mining pools, and I started mining with this relatively new Verge coin pool that's mentioned in this video: https://youtu.be/jKAoZnZIsIE
And the miner config details for it are listed in a comment by the video author.
I tried that, and it's accepting my shares. So, all good, now!
I tried the scrypt pool with my Nvidia rigs and the results were abysmal. Many other coins much more profitable to mine with Nvidia.
Which coins do you find are good for Nvidia GPUs?