I just did the Accelero III mod on my 1080 today, I've been using Argus Monitor.. (I saw it in a 2070 Strix mod on reddit). It's $20 for a 3 yr license (which really isnt that bad), and you get a 30 day free trial.
Works like a charm.
I'm in a similar boat with a EVGA 1080 SC; Im in the process of getting Noctua fans but havn't bought a new cooler (yet), have you tried setting your bottom fans to exhaust? - It might save you some money and headache.