Your jetting will change depending on weather conditions, fuel and elevation.
That being said with out providing a lot more detail in terms of the conditions. I run a 99 stock moto with a dual pump around system and a 170 main will only work at high elevation and a HOT day. Chances are that your main is to lean. I run a 175/55 as my starting point. I have stuck my motor before and it has always been related to a lean condition. Fatten it up… start with a 178/55 or for a new top end break in try a 185/55 make sure to get it up to temprature before hitting it. a little on the hot side is better that cold. Bring the temp up to at least 140 degrees then run it at about 125-130 degrees.