I'm an fisheries scientist based on the West Coast USA. Traditionally, I have focused my underwater work in rivers of the Pacific Northwest, but recently been shooting pelagics during grad school in California. Soon, I'll be moving to Alaska and I'm looking to upgrade my setup for my new R5II. For the past 5 years, I have shot with an R6, 8-15 F4, ikelite housing, and 8" dome. As I switch to an aluminum housing for the R5II, I'm prioritizing compact size to reduce drag in river shooting. Any tips here? I was recommended the WWL-C + RF 24-50, but read dismal reviews here. Now, I have shifted towards the Marelux housing and 140mm dome with my 8-15. I'd entertain a wet lens setup, if the size and IQ are competitive to the 8-15 fisheye & 140mm dome. Any ideas are appreciated!