Was in a similar shoe as you but decided to keep my MT7 brakes as is for my Pro model. Love MT7 brakes (Good stopping power, great modulation and love the lever shape) with exception of squeal/squeak which I can't seem to get rid of. Even after changing pads to Galfer Purple and new rotors. The noise isn't that bad but just not use to having noise from the brakes. My 3 other bikes have minimal, if any brake noise. They all use Galfer Purple pads. I have brand new set of Hayes A4 brakes sitting in my garage which I bought while back and was looking to swap out but decided not to. My main concern is that you have to drop the motor to install the new brake hose + possibly really tight hose fitting which can be a potential pain in the a$$ for brake hose install. Hayes brake hoses are slightly thicker than typical Sram, Shimano, Magura hose.
If you want stronger stopping power, try Galfer Purple pads with 220mm rotors in the front before you decide swap out the brake system. Magura does make MDR-C in 220mm.
I can't remember where but I did see a YouTube video of someone who installed A4 but it wasn't on Amflow but another bike that had Avinox. It originally had MT7 but he switched it out to A4. From his comments, it seem that A4 had more on and off bite kinda like Shimano vs Magura. Of course, lever was very light on A4 vs Magura.