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It is quite likely the work performed has introduced a subtle air leak that only manifests itself under high boost. Pressurizing the intake tract with the car off will help you identify the source of the leak. A hose fitting that isn't honked down all the way will exhibit this kind of behavior under boost. I like how Jafro figured out the source of his car'...

You can use this tool to get the job done. They are called Hose Clamp Pliers. This is not the right tool

I Believe It's a Hose Connection Point Unmetered air whether it's a negative pressure or positive pressure is bad. That being said, I find it interesting that losing some of the boost isn't detected and triggering a CEL. So that maps to your idea of a smaller leak along with the not subtle high pitched sound. You said If it were a bad gasket, I'd ...

If nothing else is available, I'd consider boot-pinch pliers, aka nail puller pliers, because the sharp edges will go under the lips and its going to be less likely to slip off than the C clamp. Of course the right tool (as per other answers) would be much better, but for a once-off task then the right tool is quite expensive.

Slip joint pliers can do the job quite well, but I usually use a pair of Vice Grips. There is, however a tool made for this. Here's an image of one: It's called a: Spring Clamp - Flexible Ratchet Tool

I think that's called an Oeticker clamp, and it's an inexpensive "one-time-use-only" band of steel that is slightly larger than the OD of the hose, with a little squared-off loop on one section. It is "clamped" at the factory with a pair of pliers (or perhaps an automated machine) that looks something like barb wire cutting pliers. It's inexpensive and has ...

I ended up getting a 3/8" hose clamp from Home Depot and it worked!

The culprit was right here: If you look closely, I made two errors: 1. I put the clamp on at an odd angle. That was dumb because that made it hard to torque down properly. I should have had the main shaft of the clamp pointing up. 2. I didn't torque it down well enough. If you look closely, you can see a hint of a gap between the metal and the hose. Guess ...