in_shore, please discuss the Schroeder Method with equipment manufacturers prior to trying. Responses may range from horror to curiosity, from an abject rejection of it as though it could harm the gear, to confidence that the gear will be unaffected. Also, this is a do at your own risk method.
Very likely the Kronon doubled would handily outperform whatever typically configured IC in XLR you would use. The only way to perhaps best it the RCA with Schroeder Method, imo, would be to apply the Schroeder Method to the XLR. But, as I have found in the past, any given RCA cable can best any given XLR cable of a different brand, and vice versa. One simply has to try the configurations to know for sure.
You may not be able to know with certainty that you have the best configuration, but you should be able to make a significant improvement from where you are now, which makes for happiness.
Very likely the Kronon doubled would handily outperform whatever typically configured IC in XLR you would use. The only way to perhaps best it the RCA with Schroeder Method, imo, would be to apply the Schroeder Method to the XLR. But, as I have found in the past, any given RCA cable can best any given XLR cable of a different brand, and vice versa. One simply has to try the configurations to know for sure.
You may not be able to know with certainty that you have the best configuration, but you should be able to make a significant improvement from where you are now, which makes for happiness.