Yes, midiquest appears to send an entire program parameter dump for each individual parameter change, instead of just directly change the parameter in question. Why midiquest does this, I’m not sure. Perhaps there is no direct sysex string to parameter change for this synth and the only way to send those changes is via a program dump.
Again, the only way to know is to get the sysex doc for this synth. We can guess all day.
You may want to see if there is a midi menu setting on the ATC to turn on or enable controller messages to be sent when making a knob/button change. Many synths have the option to have this on or off. If it does, we could see what the string is for each parameter.