Helios is one of the few SPI balls I didn't buy, so I have no personal feedback to give you. I can give you observational feedback, though: What you're dealing with, a lot of other people are dealing with the same thing.
The complaints have been the ball is too much shape, too "fast" on the fresh but you can't really chase it inside very far. A part-time teammate of mine has it and I haven't seen him struggle so much with a ball before. Like you, he has a Zen as well and that ball fits his game a lot better on house shots.
Just personally, from watching it I don't think it's the best option for a league shot. Despite its issues with excessive shape, I think it has to have more volume across the lane in order to work its best. I basically think they responded to complaints about the original Idol being too round and overdid it.