You have been given feedback for those issues, so yes, you need 'for'. I would use "take another look" instead of "re-look". There is also something wrong with the overall structure of your sentence.
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clarencePlease note that Round 2 for you to re-test those items which you have given feedback for has been planned for next Wed (18 Dec).It's virtually the same as the first sentence you offered for discussion, though it's a bit clearer. I still think it's too front-loaded, though, i.e., it has too much subject.