Pics of it open and in full light? Looks healthy and happy so far.
I've never really dosed 2 part equally before, but I know that it won't actually harm the clam much if your calcium and/or alkalinity are low. Mine have been hovering in the high 300s the last few months because I just wasn't paying attention (I spend too much time focused on alk, not on CA). They just won't grow much, but they'll still be relatively healthy and happy in the short to mid term.
Lucky that yours is settling down though. My maxima never really moves around much, but dangit this derasa keeps moving every few weeks, using its foot to hobble around the non-existent space on the floor of my 29g cube.
Nice find though, can't wait for more pics!