I have an Equalizer 10k and it can make quite a bit of noise at times as well. I'm with bsmith - I wouldn't buy a new hitch if it was adequately sized and it controlled the sway. The EQ has pads that sit under the bars and reduces the noise quite a bit. Not knowing how your hitch works, have you checked with the manufacturer to see if they have anything similar?
That said, my EQ hitch is too small for my new TT and I'm considering the SwayPro as well. I like the design and also the zerk fittings for the grease. Also, the bars can be upgraded to heavier or lighter and not require a full replacement like I'm facing right now
