James: I really enjoyed both your performance & your recording of Take That's "I'd Wait For Love":

Your recording sounded fine thru my Sennheiser HD650's.
I didn't find the piano/vocal much (if at all) out of balance or harsh.
I can't get over how much your wife's voice sounds so hauntingly reminiscent of the late great Karen Carpenter.
and echo Saswick's sentiments, and hope you and your wife might consider recording some of Karen Carpenter's legendary songs now: