If you had edge path conditions and could raise the antenna to line of sight (LOS) conditions, I'd expect to see a big improvement. But because you are already high enough to have LOS conditions, I wouldn't expect the signal strength to change much.
You have a very good signal report. The signal from WVNY faces a significant challenge though... The powerful signal on real CH-12, CFCF is predicted to be more than 38 dB stronger than WVNY's signal. With that much difference in power levels, the tiny amount of 'out-of-channel' emissions from CFCF can easily be a source of strong interference to WVNY's signal.
I'd try using a full size High_VHF antenna pointed directly at WVNY. One Antennacraft Y10713 would be the tool I'd pick for the job. It's even possible that two Y10713's in a stagger stack arrangement may be needed.
http://forum.tvfool.com/showthread.php?t=1024 The goal of stagger stacking would be to reduce the amount of signal received through the rear of the antenna array.