I lived about 10 minutes away from Spot for a number of years. I have walked completely around it, fished in coves on the 93 side, walked around Turtle Rock and fished in that cove, walked to the boat house and around, fished the parking lots and the few beaches.
Only success I ever had was on a rooster tail inline in the first cove walking down from parking at the Ice Rink. I grabbed back to back smallies that day, biggest was about 2 1/2lbs. Out side of that, nothing.
I have seen giants swimming around the rocks, drop offs. They never seem interested in eating....and watching the bluegill around them chilling tells me they aren't eating them at least.
I have never taken the boat out there....but for the boat fees at Spot compared to the fees at the Q, I would never. I'm under the impression they rent hourly and for a daily rental for a motor boat and gas at the Q, I get a few hours of rowing at Spot.
If you want giants, keep testing the depths. If you want fish, walk across the Fells and fish Dark Hallow. Not any big 'uns, but you will get a couple. I only fish Spot for trout at this point. And I still avoid it unless they just stocked or I drive by and see peoples rods popping from shore.
Even ice fishing we get skunked A LOT. Good chance to get to water you can't from the shore though. And one of the islands has a 1600's gravestone on it and a few really large bald eagle nests. There is a resident couple that winters at Spot so keep an eye out for them.
Good luck and tight lines....but if you're at Spot hopefully it's not tight because you are stuck on a rock!