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If you can get it at that price seems a reasonable option, can do 57 x 43mm size frame at max magnification, it's got a 43 sensor which is good - you'll have basically the same issues you did with your RX100, though it can do reasonably small subjects for macro alone. Get a vacuum valve for the housing it is well worth it.
The Inon D-2000/D-200 and S-2000 (GN20 and 100X100 degree angle or 105X95 for the S) are sufficiently strong for CFWA. The YS strobes on paper have more power, GN32, but that is only over an 80X80 field that shows a lot of gradation. To match the Inon D/S-2000 strobes wider and more even dispersion a diffuser has to be installed which gets to the 100X100 degree field but drops the GN to 24. Which is what the older Z240 was or is though now discontinued. The Z-330 is a GN33 over 100X100 degrees, it is a strong strobe. I have a pair of D-2000 strobes and do shoot CFWA. Yes, more power is useful but so is a wide and even field of light. I would take an Inon D or S-2000 with their wide and very even lighting over the YS with the 80 degree field. Bump the ISO from 100 to 200 and the GN20 of the Inon strobes vs an actual working GN24 for the YS and the difference is gone. But I am an Inon fanboy. Because they work. But my original Nikonos used flashbulbs and only sometimes worked but they would blind every fish on a reef and divers too when they did. So I am easy to please. And to be clear, the S-2000 is essentially equal to the D-2000 and new release D-200 both in power and coverage.
Guide Number - 32
GN - 24 (with Diffuser 100 attached)
GN - 20 (with Diffuser 120 attached)
Beam Angle - 80° x 80°
100° x 100° with Diffuser 100
120° x 120° with Diffuser 120
Guide Number (*2) 20 [without a diffuser]
17 [with supplied -0.5 White Diffuser]
Beam Angle 105°(horizontal) x 95°(vertical) [without a diffuser]
110° x 110°circular beam [with supplied -0.5 white diffuser]