You are right - F-35s can't do the same job. You are wrong - the F-35s, namely the STOVL variant which was overweight (not the other two variants), has been redesigned to capture approximately 2700 pounds in direct weight reduction and approximately 600 pounds equivalent reduction by increased engine and airframe performance. This STOVL (short take off and vertical landing) variant will not be overweight.
BTW, given the reports about effectiveness of F/A-22 against F-15s during initial operational test and evaluation exercises, and increased abilities of Indian F-15 pilots against US F-15 pilots, and you will see that F/A-22 is a necessary weapon system. The claim that there is no known system which can compete with it is (1) good - military done right is military that is unmatched, and (2) short-sighted reason to argue for its cancellation. I'd hate to be the person who says to the next President "Gee, if only we'd known that the Russians were building the Mig-nn, we'd have kept the F/A-22."
Okay, that's 3300 pounds. The thing was over 4,000 pounds overweight specs. Where's the rest come from? It's important, because is it's too fat, it can't carry a useful weapon/fuel loadout for its designated job.
The IAF doesn't have any F-15s. Familiar with the restrictions placed on those F-15s during that joint exercise?