No, we don't "need to reset," but it makes sense to not go over 3 years in a row.
Going over by a little bit and paying 50% on the little we go over by is not going to matter much, but if we choose to want to go significantly over for 2021, then resetting the tax, now, is reasonable.
I'm thinking we try to stay under for 2020, but if we look like we have a chance to win in July, we may decide to spend and go for it. If we look flat, we will likely decide to stay under and maybe have a mild sell-off.