I also love using the SSG transformation for grinding PQ’s. The reason why I’m specifically using the Beast Transformation method is because it’s +30% Ki blast stat. I would use SSG only if I’m running a melee only build. SSBE is another amazing transformation but the trick is to having good ki regeneration and regulation.
It is indeed RNG but I always end up unlocking the skills on my 1st, 2nd or even 3rd try when I play the PQ’s online with other players. Just a hypothesis but I think the game adds the other players RNG to yours. The more players in a room, the better the chance is that I get a skill.