Getting exact TPL consistency on a machine where traverse is not linked to speed and traverse distance is not linked to the machine is difficult at best. In my experience you have to make sure you set your speed to the RPM that works best for you and ALWAYS run it at that speed.
Then, set the traverse throw distance for the desired coil height.
Next you also need to play around to set the traverse speed to get the TPL you want. I always use the counter and simply count the number of turns it takes to complete ONE layer. I repeat this many times to make sure it is correct.
If you change the traverse throw distance (ie HB coil height to Strat coil height) you'll change the effective TPL count. Note, any change in RPM for the winding head, AND/OR any change in the traverse speed, AND/OR any change in the traverse distance, will change the actual TPL number.
Hope this helps!