What kind of trigger extension do you have? Do you mind if you share a picture of it along with your tray?
This is my rig when set up for wide-angle:
This is the trigger extension that I use: US $65.0 |Aliexpress.com : Buy NiteScuba Diving Shutter trigger for TG5 TG4 Sony RX100 nauticam Canon g16 Fantasea Nikon Camera housing Underwater photography from Reliable Photo Studio Accessories suppliers on NiteScuba Store
Note that I had to raise the right handle by about 1.5cm for it to fit properly. It's a generic Chinese tray that I got from Aliexpress along with arms and clamps. The strobes are SeaFrogs ST-100 Pro which I cannot recommend - manual mode works only with wired triggering, and when triggered by fiber optics, they work only in TTL mode without compensation, broadly similar to Sea & Sea YS-03.