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Pure speculation here. Maybe when you have a "specialized" antenna, is it possible that the amp that goes along with it was considered as part of it's design? Or what if the new amp doesn't reject FM and the old one did? (and I'm not even sure that FM is an issue here or not)
What I'd suggest, for troubleshooting, just connect to one TV. That way, you can rule out any other factors having an impact. So I'd test w/the old amp, collect some sample signal strengths, then do the same w/the new amp. Comparison of signal numbers will give you an idea of how the two perform.
Did I see something about a 4-way splitter for 3 TV's? If so, be sure and cap the open connection or get a 3-way instead. That will help you, regardless of the amp used.
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