The Crash and Hexplosion have excellent length. The Hexplosion, with equal polish will push the most but the Crash is much sharper downlane. They are NOT low RG. They have the same if not higher RG than the SSP. The Dry Heat is also another excellent med/dryer ball. It´s smoother downlane than the Crash and Hexplosion but it still can turn the corner and hits very well.
That being said, more information is needed about the SSP and what layout it currently has to help with ball suggestion/layouts. Furthermore, more information regarding the desired ball reaction is needed. You say you want more length, but harder backend. That could result in a ball that hooks more. Do you want just more length than the SSP but smoother since they are "fried/patchy"? Judging by your profile, it looks like the Scout is not the correct ball so probably other similar 3-piece balls aren´t the answer.
Just provide a little more info and I´m sure tenpinspro, EXCALIBER, myself and others will gladly suggest a Track ball and layout.
--------------------
Anthony Chapman