I was deploying them at upwards of 2000 meters. Turns out the problem was the module manager dll had disappeared from my gamedata folder so RealChute was not working properly. Reinstalled it and all problems solved
I have both the latest FASA pack and RealChute mods installed, however every time I deploy the chutes, I go crashing into the surface at 60 m/s. I'm really not sure what the issue is, considering I have the most recent RealChute installed as well