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It is unlikely that you will find a single aiming direction for a C2V that will satisfy your requirement for reception of your main stations plus that ION station, the angle simply is too wide and WRPX is going to end up in a null of the C2V's UHF pattern no matter what. The fact that it's behind a big oak tree as viewed from your mounting location only makes the situation worse.

My recommendation is to get a small UHF Yagi (42XG, for example) and aim it separately at the ION station. Cherry pick its location to receive it reliably.

Then, use either an A-B switch to select the desired antenna, order a custom-made single channel combiner, or take your chances with a simple reversed splitter combining the two antenna.

This is actually a fairly common situation for ION stations nationwide. Their predecessor company, Paxson (which went bankrupt before ION came along), had a real penchant for putting their towers at the cheapest possible location so as to satisfy City of License requirements and to simply gain carriage on local cable and satellite services without much regard for local antenna users.