You Ed me and I tryed to respond -it was a no go.
In public - If you are turning 7000 on a AA I would assume you are in the 1,000 HP club a little under what that HP is.
If you go to our AA you are going to drop some 400Rs. Not what you want.
So lets take what I said as I said it. Blown Gas our Impeller is worth 6-9 MPH and ET Cut.
Combination of Impeller and Bowl in that Class is 10 to 16 MPH. @ 7200 to 7400 in our A cut is 135 to 145 NJBA and 130 to 136 In IHBA.
OK- I do not Recommend you change more then 1 item at a time on a established runner system such as yours.
So #1 Change the Impeller to our AA that should hit you around 400 Rs drop ( you may have some torque at that number yet). Then we establish a cut. The class runners in Blown Gas (Bigger #s Nelson, Harris,Bruce, Nagore,Etc -Frank was running bigger on the fuel boat) were running a A or a very minor cut to the A. Something we ran into on the set ups was more water being demanded by the impeller. The Impeller will show you a Increase MPH and Decrease in ET. Yet some amount will go to overstuff in the bowl which is somewhat lossed. Remember the Combination of Impeller and Bowl is capable of putting out 400 to 500 GPM above what you have ran. Insert (Choke) Change will most often be changed to larger Dia. also.
So I will Back the Impeller should you not like it and buy it back. We do any cuts. OK