I'll be curious to hear how well they work together. The guide number for the SeaDragons is 20, so going to something like a YS-D2 (32) would be a pretty drastic change. I imagine with the added RAW capability, I'll be trying more reefscapes, so the additional strobe power would probably help quite a bit. I also am curious as to how well the flex arms will support a heavier strobe. It's only a 4oz difference (18 to 22), so it probably won't be an issue, though.
Weird how you mentioned the YS-D2 strobes as those are the ones I was specifically looking at getting. If I pull the trigger, I'll definitely let you know how they pair up and how they fit in the Sealife tray/flex arm system