I recently bought a stubby stock from Bushmaster. I installed  it on a dissipater only to find it short stroke all but the hottest ammo. I tried many fix's but to no avail. In desperation I cut 3 coils aprox 1" off the buffer spring. I heated and beveled the last coil. At the range today "she" performed flawlessly. There was no excessive stock impact from the buffer or increased slap at the cheek weld.
P.S. I consider this a builders mod. not a trouble shoot, so please don't hassle me.

I'm not hassling you, I'd just like more info.  [;)]

Is this on a .223/5.56 gun?  (I'm asking because of your username.)  Were you using a carbine buffer & spring or one from an A2 stock?  The dissipator has the gas port at the standard carbine location, right?

The dissapater in question is a Bushmaster factory assm. A-3 upper. This is a standard 5.56 cal. all "bush" internals. This gun functioned perfect until the addition of the stubby stock. I called Bushmaster and they told me that the spring and buffer provided should have been to carbine specs. Whitch they did seem to be. The spring was however much stiffer than my telescoping's buffer spring, but the same length. Also the gas block is at the same location as any standard 16" barrel w/carbine length gas tube.