String trimmer revving too high at WOT?

Someone gave me a 52cc string trimmer for free because they say it wasn’t working. We would only get it started by dropping a few drops of fuel into the cylinder, and it would idle quite high for a few seconds and die.

So I took apart everything, every single screw, carb, crankcase, ignition, everthing. Cleaned it up, made new gaskets myself with gasket paper (half of the cylinder gasket was nowhere to be found), and put it all back together.

Pulled the string, and it pretty much started at the first try, I adjusted the carb screw (it has only one), the carb looks like this:

I left the screw in a position that if I thighten it more, it idles erradically and if I tighten a little more it starts to die. And if I loose it, it bogs down when giving throttle.

My concern is that, when at WOT, it feels a little scary, like a racing engine. Im quite sure that it’s not sucking extra air anywhere because I had that issue on a chainsaw and it would idle very high, this one idles perfectly.

I saw a stihl weedwacker that would barely make noise at full throttle. i know, we can’t compare them, the stihl costs like 10x times more money. The one I have is a generic chinese machine, and it does have a sticker that says “114 decibels” so I guess it’s supposed to be noise.

Are these cheap 2 stroke engines supposed to feel that powerfull at WOT?

I am not planning on spending much money on it, got it for free and just working on it for fun, but could something be causing it to rev too high at wot? Or is that normal? Everything else seems to work perfectly, starts easily, idles fine, great throttle response, it just feels like it has too much power. I am using a 32:1 fuel mix (that’s what the box it came in says should be used).