I'm not doubting the reading off the machine, if it says 20, then that's what it was.
But you can't compare it to another bike unless they were there on the same machine.
The only thing that mattered was the difference from before and after the mods.
By the way, hats off to the op.
Most people talk of potential BHP through upgrades, (me included) but very very few people actually put their bike on a dyno.
So i doth my cap to you sir.