Hi, I have the same problem. Wrote on a forum not once, nobody answers.
Configs are all standard, in them you won't make much. Everything becomes according to documentation: https://help.ubnt.com/hc/en-us/sections/200887544-EdgeMAX-Configuration.
Problem with IPSEC + 2 ISP. IPSEC works incorrectly with reserve provider.
There is a bug: https://wiki.strongswan.org/issues/809