How long have you had the three Springers and are they still doing well together? Do they hang out as a group or pretty much do their own thing?I have a trio of ignitus anthias, 15 green chromis, and 7 pajama cardinals in my tank. The pj cardinals are fairly new additions but the anthias I have had for 4 years and the chromis for 2.
The key is for anthias is buying all females to start and getting them trained on a freeze dried and/or dry food like pellets or flakes. Frozen is great too but I have had skinny anthias waste away on me during previous attempts. You want to throw in dry foods as soon as possible to keep their weight up. I also soak my foods in phytoplankton I grow myself. Anthias can be very frustrating because they don't arrive in good shape most of the time and the weak ones rarely make it.
Chromis are hit or miss, my group of 15 is really 2 groups split up, I have had a few die from being excommunicated from the groups and they just waste away.
I would avoid every damsel as a shoaling fish as they are only shoalers before they become sexually mature and then they start to carve out their own territories. Springer's damsels are a nice addition to my reef, I have 3 that are pretty mellow. Sgt major damsels are very territorial even when I have observed them in the wild while snorkeling.
My PJ cardinals get along really well. I would say they are the best shoalers in my tank, although they don't add a ton of movement like the chromis and anthias, they just hang out.
Each fish definitely have their pros and cons.