I don't think the gain would be worth the hassle
Have you tried putting together a slave flash yet? I'm not super happy with the range of the flash on these homebrews simply because I'd like to see 60-80 feet out in clearings. I just ordered a Vivitar 2800, and will be getting a slavemaster board sometime soon to try out. I'm wondering if I can fit a W220 with three C batteries, the yeticam board, and a slave flash w/4 C batteries all in a 1060 case

Have you timed the W300? Is the startup time better than your W150? Just curious!