I have a 96se 1500 with a 06 lehman kit.
I run the back tires a 20lbs,the front tire at 40,since I have adjustible air shocks,just me,12lbs,two up depending on weight,20 to 40lbs.
Another thing,do you have a rake kit on it,also do you have progressive springs in the front forks,if so remove them and put in stock springs with new oil,will make a big diffrence.
Another thing because lehmans have a strait axel they will ride a little rougher then a stock two wheeler,but with some playing around with adjustments you can get it to ride where you like it.
Good luck.