Are you using the standard soft parts or the carbon reinforced? I noticed some mushiness before I did mine with the carbon reinforced. The soft tower will flex. The carbon reinforced doesn't.
If you go to the carbon-fiber shock tower, you will get a little of the mushy feeling from the front. I had to add 5mm of shims between the tower and upper shock mount.
I have since upgraded to the EVO6 bulkheads, which are milled to mount the towers 5mm further out, and the TB-04 carbon towers. This really improved the consistency and feel from the front end of the car. It also allowed the finer shock angle adjustments. Only downside is the new towers are made for the new short dampers (same as EVO6
). I was able to use standard shocks\HPI Silver springs with the new 418 threaded upper and 1mm-down lower and was able to get down to ~4mm ride height - most tracks are 5mm min so good enough.
The rear is where I noticed a nice little perk. With the tower mounted more to the rear, and the use of a standard width tower, the body post are now the same as my 418. All my bodies are universal again.
This is going to be a fun indoor season.