As the KF is mainly a high grip car, you would at least need to add the low grip conversion as well as the shock flip bulkhead to move weight even further back. Of course your buddies mid motor cars have more weight on the rear, that is the design differences between the cars. They are running more of a SV2 car than yours. Swapping the LG chassis and flipping the shocks will add about 5-8% more weight to the rear. That is a big change.
If that doesnt work, throw down an SV2 and leave them in your dust