I'm not sure I follow, because it seems to me that Task 1 should not be in the critical path (if you started Task 1 on Wed instead of Mon, it would not change the start date of Task 2, meaning Task 1 has 2 days of slack).

If it is that you need for the task to finish during work hours Friday, maybe try setting a FNLT constraint on Task 1 for Friday and see if that helps.