Personally, I would move the breeding pair to another tank as suggested, but keep them in there with the eggs after they spawn. One of the best things about breeding angels is watching the parents care for their young.
I used to have a breeding pair in my community tank, and it was such a joy to watch them fanning the eggs to keep them oxygenated, and then picking them up and moving them around, both at the egg and wiggler stage. I also couldn't get them past the wiggler stage, but like I said, I had them in a community tank and it just wasn't set up for breeding.
From what I understand, they'll do best without a substrate (wigglers tend to get stuck in the gravel -- maybe sand would be alright?), and a sponge filter (same reason). Do a search on the net and I'm sure you'll find lots of more specific info.
29g Eheim Classic 2213, community, heavily planted, 65W CF, 2x Hagen CO2
20g Fluval 3 Plus, nothin' but shrimp & snails, 65W CF, Hagen CO2