Advantages of timing changes start to come into their own when you have internal engine mods, ported heads higher compression ratio, cams etc; or if you are running different fuel.
The more air/fuel you get into the engine, the greater advance needed to cleanly burn it all. More advance equals more power up to the point of det, so timing adjustment is critical for squeezing that last ounce of power out.
You should be able to make gains on a stock motor with timing and fuel adjustments, because you can tune bike specific and remove production conservatism, just beware; get it wrong and it can get expensive in spectacular fashion.
Before doing any timing adjustments get yourself some really good det cans, you can't map timing by guess work, you have to know what's going on in the engine. I use the Pro Tuner kit from Knock Box
, it has dual sensors (ideal for V twin engines), and can be fine tuned to filter out normal engine noises.