The nominal gain of the EVAL1 with buffer stage enabled is 27 dB, or ~22.4x. It takes 1.8V to reach the nominal rated 200W output (8 ohms), though the actual drive required to hit hard clipping will depend on your supply and mains voltage. Having up to 2V is not excessive.
And having a little extra gain upstream is not crazy. You might want to turn up some low level recording. So the concern then seems to be volume control resolution. What will you be using? If a simple linear stepped attenuator, then yes, you'll be maxing out at about half position, with crude steps down the range where you will listen most of the time. But, if not, then it won't behave that way. If, for example, you use the volume control on the Gustard (right?), you would have good control in reasonable dB steps, all the way up.
Maybe try your chosen volume control method first, and then, if the potential to overdrive the amp in some cases still concerns you, add a good in-line attenuator.