Here's what I'm using. It probably needs more tweaking but it works for now. MAKE BACK UP COPIES of your aircraft and FSX. config files!!
Add the following to the bottom of your aircraft config
[TailHook]
tailhook_length= 3.0
tailhook_position = -25, 0, 0
cable_force_adjust= 0.88
[launch_assistance]
launch_bar_pivot = 15.4, 0.0, -2.17
launch_bar_lug = 15.8, 0.0, -2.23
I also added the below entry to the FSX config to the bottom of the [REALISM] section. This will allow the sim to adjust launch speeds based on aircraft weight and payload. This entry really slowed down the launch sequence for me.
[REALISM]
CatapultForceLimiter=0