The best way is to put it on a dyno. Other things that may indicate that it is too rich is the throttle is not smooth when accelerating and when riding at slow speeds. I would start with 5% and 10% and see how that does. Then go up from there.
Also make sure you open the secondaries 100% and copy the I4 map to I2 and I3 for full power.
Make sure that I4 was copied into I2 and I3. The easiest was to tell is hit the "g" key and bring up the 3D graph, then click each tab and look for differences.
All you need to do is add the % to each cell in the L maps, don't worry about changing anything else there.
I make decel mod(add %) in map 20219, full power, I2 I3 are same I4, plug the O2 sensor eliminator, uncheck the O2 sensor fited in TE, downlod the map to ECU, reset the adaptive settings and............the bike still very lean. Whit O2 checked or not , whit the sensor eliminator or not......the bike is very lean. I dont see any diference whi O2 or whitout O2 sensor. When I plug the O2 sensor eliminator the bike is more lean than whit O2 sensor on.