Hard shift to 2nd and 3rd

Be very careful on just how much you lower that throttle pressure.
Too high will cause later and hard shifts.
Too low will cause low and soft to mushy shifts which will inturn cause a slip.
It's very easy to burn a transmission out with low throttle pressure,find that happy medium where you can still feel them yet they are comfortable shifts.
First shift point should be around the 15mph range and the second around 25mph with a correct throttle setting.