Again I think this is being aproached the wrong way. Leave SS alone and add a 10.50 to 10.90 index class.
I'm up for a faster index. Pardon me but what do you mean by no box
Leave it all alone, either build a truck to compete in SS as is or detune and run the 11.90 index. Adding classes only delutes the existing ones. A low 10 second truck many time wins the SS class due to the 9 sec trucks breaking. Case in point the world finals, Rob never had a decent pass all day due to an electrical problem.
I think your missing the point of it being a transitional class to help people build up to the SS and PS class's.
With your logic why not just eliminate the SS class all together and have the SS guys run PS? Hell H&S won the first race of the season running mid 11's.