Good hands. I often make it 1 bb extra when I'm isolating fish to create a bigger pot and make it more difficult for the regs to 3bet me. The only problem I find with the strategy is that if a good reg does realise that you are constantly trying to isolate a fish he will 3bet you more and the bigger initial raise size you used makes it more difficult to play back at the regs constant 3betting because of the SPR.