The way I read it, Sturn was talking about removing the WTx2 cap and replacing it with WT+30, so that no matter how high someone’s WT was, they never got more than +30 over that and so they always took a more reasonable time to heal their WT.
WT+30 would be just as hard for a Wookiee at WT=27 to heal from, as it would for a WT=10 Toydarian.