Replacement Drivers for Height/Atmos

Hey guys. New poster here. Im trying to get some help with updating some old speakers on the cheap.

I know this is going to sound crazy but I think I need to replace my 4" drivers in my JBL n24's that Im using as height speakers. Yes, I said n24 LOL. I picked them many years ago thinking they would match fairly well with the tonality of my JBLS38's. These n24's are "breaking up" at volume which makes me think I need something to handle the power. If I run the same height signal to one of my mains, the sound does not distort. The n24 are only rated to 100 watts. Im thinking I need something better than 150 watts. I tried a speaker rated at 125 but still experienced the distortion. (less at the same receiver volume but still there). Can I get a 4" driver to bring the power rating up of these little speakers? This is a budget system so purchasing SVS, Klipsch, or other purpose made height speaker is not an option.

This is about the only one I could find in a higher wattage.

https://www.parts-express.com/morel-...-ohms--297-002

Thanks