Well, part of your problem right there is 2N3055... it's a bad transistor from an early era. On the upside, modern production parts are rarely as bad as the datasheet allows... but it's still a device best left forgotten.
Second is supplying enough base current. In saturation, hFE ~ 10 is pretty typical. That means you need 1A of base current. 2N3904 isn't going to do that. You could use a TIP32 (rated for 3A), but it, in turn, needs about 0.1A. So you really need to add one more transistor to bring the opto's 10mA up to 0.1A for the next two. A 2N3904 would work there. To wire this in, you'll need to swap around the optotransistor's connections (collector to OUTPUT+, emitter to 2N3904 base; then 10k across B-E, and C-E where the opto is shown now).
Expect about 1V of drop across this thing. Not exactly a good relay (why does it have to be an SSR, anyway?), but I suppose it'll be faster than a MOS type (which isn't very available in this kind of current rating anyway).
Tim