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I'd assume your best signal reception for each problem channel is when you point right at each, although if blocked dead ahead, a little left or right tweak may boost your gain.
A larger antenna will likely help, but it may bring it's own issues. The bigger the antenna, the more directional it tends to be. Think of it like a flood light vs a spot light. Two 100w'ers aimed the same direction. One will light up a wide range, but not deep. The other will put a beam far away w/o much surrounding light. That's a way to imagine how the small and large antennas compare. So that smaller antenna allows you to aim between two signals and pick up some of each. If they're far away, (or blocked to some degree) you don't get enough of either to matter. If direct aim doesn't help, then a larger antenna aimed directly may do it. But you typically can't expect it to give you both if aimed between.
Multiple antennas can help but you have to have the tuners or switching to manage multiple signals. The other way is installing a rotor. If you can tune each when aimed dead on, then the rotor would do that for you on demand. It's a PITA, but it is an option.
Outside of that, I do wonder if something like the AD ClearStream 2-V would help you out, in terms of having the reflector on it. You could always try to go bigger.
But in the end, nearby trees are gonna likely impact your reception.
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