Flash triggers / Wireless Sync / WTF?

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My strobes (SeaFrogs ST-100 Pro) only work in TTL slave mode when triggered by fiber optics. I'll try manual mode once the Retra Pros I pre-ordered (a year ago today!) actually ship, but seeing as how I rarely see exposure accuracy issues with TTL, I don't expect to use it much except in some corner cases.
 
I have sonyrx100M5
I use seafrogs housing for sony RX100 I-V
I use seafrogs strobes ST-100 pro

I have 2 issues

1 in manual mode I can't change the shutter speed because the control wheel is not accessible from the housing, only the aperture I can adjust and the ISO

2 the strobes setting when I shoot in STTL the picture is white even when the exposure is -0+ and as per the setting recommended from the site

what did I do wrong

thanks
 
https://www.shearwater.com/products/perdix-ai/

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