[ADTech]

I am concerned about overloading my amplifier with the powerful signals from Toronto.

You're not going to overload a Juice. I've tried...really really hard.

I am having difficulty determining the beam width of each antenna. Are they 30 degrees? Are they both the same?

See sheet 1 of the respective data sheets. Note that beamwidth, and, consequently gain, varies with frequency.

Basically I want to increase the ever so weak signal from WGRZ Buffalo, and lessen the dropouts, without affecting the other Buffalo stations.

Probably an impossible task without resorting to highly selective filters and very meticulous amplification. The guys at Tin Lee can probably do it, it would likely cost hundreds of dollars (US OR Canadian).

I found that Toronto signals will always come in, even when the antenna is peaked at Buffalo.

With signals that strong, a simple piece of wire would pick up many of them.