Different stringers, different result
The difference in playability of your stringbed can come from the difference in machine or condition of it.
The machine can only offer as little loss of tension as possible.
I think that it is important to compare the end result.
Important to know is, what difference in playability do you feel:
- More or less power.
- Shorter or longer ball-contact.
If you tried a number of stringers with the same result, it could be that something on the Old stringer's machine was not as it should be resulting in a lower result.
If his clamps have been slipping his result will be lower.
Does your stringbed feel stiffer or softer?