So my costs w/ Windstream also went up.
Turns out it was the landline costs going up, not my DSL costs. Since I'd have to hunt in the garage for a phone to actually plug into our landline, I asked and they set me up with a "no voice service" line, dropped my monthly bill from $160 down to $83. If you only use your landline for DSL and use your cell(s) for voice at home, then this may be an option for you. "Dry line" service is similar, but may not be supported in your area (the "no voice" is replacing "dry line" for Windstream. Dial tone, no outgoing calls other than 911, no incoming calls, phone number stays assigned to me if I ever go back to landline for voice)
Like you, I'm rural and I get ~20mbps down (sold as 25), and Windstream has fiber about 100 yards from my front door BUT it comes from a different town/exchange than what my service is on...
