Well I decided to try this mod on my own and it worked out pretty well. I immediately noticed an improvement in both stability and smoothness, but my servo arms were getting pretty worn.

The mod was straightforward, but I did make it a point to use the thicker servo arms on the HS-55's to reduce flex in the arm. The HS-55's should come with these arms so if you've already switched out to HS-55's that's one less thing or should I say three less things to buy. The only downside is the MX400 parts were a bit expensive.

Anyway here's a parts list:
1-[link=http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXLBG0]Heli-Max Mixing Arm Rod MX400[/link]
1-[link=http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXLBF8]Heli-Max Stabilizer Control Rod MX400[/link]
1-[link=http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXLBP3]Heli-Max Ball MX400[/link]
1-[link=http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXLBP8]Heli-Max Flat Head 2x7mm MX400[/link]
1-[link=http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXLTT6]Heli-Max M2 Nut MX400 [/link]
3-[link=http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXCRT4]Servo Horn Set HS-55[/link]

...and here's some pics.