I don't know your detailed situation, of course, but take note of these words from the IRS instructions for form 2210: "If line 9 of Part I is more than line 6, complete the 85% Exception Worksheet below to see if you meet the conditions to be eligible to claim the waiver. If so, you must check Box A in Part II, write "85% Waiver" next to Box A, and file page 1 of Form 2210 with your return to request the waiver." If it applies to you, that would be one over-riding reason to file page 1 of form 2210.
For more detail see my comment earlier.
