Susky is more of a walleye, smallmouth, channel-cat river. they're starting to hit flatheads up around yorkhaven dam.
brunner island (warm-water discharge) is a hot-spot year 'round however word on the street is that alot of the shoreline will disappear to a new cooling tower.
If you want monster stripers, your best bet might be https://www.stripers247.com/raystownlake.htm
Raystown in Huntingdon, PA