I've looked at his map. The phase lanes and planets on the map are all set to 1.00 for Spawn Probability. That means 100% likelihood of spawning. There's no randomness to it. The catch is that when the map is played, some of the phase lanes that are supposed to be there 100% of the time are not there. It's really quite strange. That, and the played map will sometimes add in phase lanes that aren't in existence in the Galaxy Forge map. Haven't tried looking at the .txt version of it, but I've never had this issue with Galaxy Forge maps before. The only difference between the normal version of Galaxy Forge and the one for Sins Plus is the planets in the definitions file, not the phase lanes. So... Any ideas?
P.S. If there's a sequel to Sins of a Solar Empire (Please, please, please, please...), it really needs more planet types. That's the only reason I ever looked for mods in the first place.