My group consists of 4 active pilots, and we could never ever figure out the right frequencies so we could all fly at the same time. We spent numerous hours testing, checking, tuning, swapping antennas, using all sorts of tables, recommendations, whatnot. Nothing helps. I also blame it on bad equipment, most of it is from aliexpress, but some are recognizable brands also.
Anyway, the transmitters - we have tested (and used) TS586, TS832, TS832S and TS5828 (don't really know what is the brand). With first in list being the most reliable so far, with most stable power output (checked with immersionrc rf power meter), and last one being the worst, with couple of them failing completely within hours, and some of them having very poor output level.
Now, when you look at all those models, you can quickly figure out that best one has nice metal enclosure which probably dissipates heat nicely, second one being huge with sort of "rf shield" that acts as heat sink, and last one that is nice & tiny, but you could literally burn your finger on it. I have even noticed that just blowing some air (with your mouth, not fan!) over heated up TS5828 increases output power by ~50mW.
On the other hand, we also have mixed RX equipment - 2x Fatshark HD2 - one with nexwave RX, and another one with cheaper Realacc RX5807 (which btw failed - it is now stuck on channel #1, goggles are fine), one Skyzone 2 (I presume like yours) and couple of FR632 diversity receivers to use with Quanum v2 boxes.
In theory, up to 8 pilots should be able to use 5.8G band without too much trouble. But.. I don't believe it