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Please note that your problem channels both come from a different direction, are further away, and are slightly obscured by terrain. You didn't mention what your aiming direction for the existing antenna is, but I suspect it may be misaimed for those two channels while benefiting the other ones.
You might try an aiming direction that attempts to split the difference with a bit of favoring towards the ESE and see if you can make all the signals happy. With about a 50° spread, it will become more difficult, especially when dealing with a compromised signal path due to terrain. Moving to a "longer" range antenna as you proposed will make it more directional and will aggravate reception from spread-out transmitters unless you add a rotor to physically aim the antenna in the most effective direction.
The alternative may be a pair of broad-beam antennas that can attempt to focus enough signal from the disparate directions to work without resortng to a rotor.
Do first try aiming the existing antenna directly to the ESE first to see if can pick up those two difficult stations without loosing the "easy" ones.
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