I've got the xwave 8s as well. They are really nice. If i were any smaller though, i would even want a softer boot. If you can get a pair of the xwave10s for REALLY cheep, then look into cutting them to soften them up. Just make sure that you drill the ends of your cuts so they don't follow. Too stiff of a boot sucks, but so does a boot that is too soft. Get someone who knows what they are doing to help you and make small changes at a time.
....my recomendation is to just get the right boot from the start.