To me, both "surer" and "more sure" sound wrong. The reason is that, in my opinion, there are no degrees of sureness - either you are sure, or you are not sure, you can't be "more" sure than sure. You can be "almost sure", but not "surer than sure". It's akin to "perfect", there are no degrees of perfection, it's either perfect (in which case it can't be improved and made more perfect), or not perfect. Anyway, just my $0.02.
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