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The HD7697P is roughly half-way in between your current antenna and the HD7698P in terms of performance (a guess based on approximate size and design of your current antenna). You will probably gain about 1-2 dB with the HD7697P and another 1-2 dB if you go with the HD7698P.
More antenna gain means more margin to deal with whatever is causing instability on your two missing channels. Whether or not that's good enough to make channels 7 and 36 stable is uncertain.
Indoor environments have many more random variables (blockage, reflection, noise, etc.) than an outdoor environment, so that makes it very hard to say if any given setup is "good enough". We have no way of really knowing how close you are to the breaking point on these channels and how much more margin you need to make them stable. You won't know until you try it.
If you do someday go with a rooftop antenna, you are much more likely to succeed.
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