cam timing

410 indy headed cnc -1 245 intake runner , cam flat tappet 259/265 @ 050 590 lift and 109 lobe c install 105 , 904 ,5000 stall ,low gear set ,3.9 rear ,26/10 3550 lbs it ran 10.95 @122 asp and 10.30@132 with a sniff now would retarding this cam improve et or not say 112 in stall moving the power band up ,seem to be out of puff at 6700 .