Mine works very well so far with a mix of 10 nVidia cards under HiveOS.

I need more PSUs to install more cards.
I do believe ASUS recent Bios v1001 permits 19 of any type card.

As usual, YMMV.

I've used quite a few of the 4-in-1 Risers. They work perfectly. They sit tight in the slot, and no performance problems at all.
I have MATX boards with only 3 PCI-E running 8 GPUs.

Heads up on the BCH.

I have a BTC address that worked, and was previously paid to correctly.
Today, it suddenly "turned into" a BCH address. It appears to be an issue.

According to gpuboss, they are comparable to RX 550: http://gpuboss.com/gpus/Radeon-RX-550-vs-GeForce-GT-1030

It's worth testing. I'm gonna pick some up.

I know I'm a little weird, but I love the idea of a silent rig running in a Core V1 Case.

Congratulations to the new guy on the block!
Hive OS raises the bar for GPU mining platforms.

Most people report that they are loose. Some people hot glue them.

It sounds like you MAY have another issue, I suggest reviewing the BIOS settings for ALL the usual recommended tweaks for your board—sometimes on a reboot settings are lost.