On the other hand, you may notice nothing at all except a change in
tuner
settings. But a change in tuner settings can be beneficial.

That is the main thing I am trying to do. The tuning is pretty sharp on
80-75 meters. (the dipole is 96 feet at present) It works okay, but
since I am going to experiment with higher powers, it seemed like a more
forgiving tuner environment might be a big plus. Plus of course not
having to use as much inductance.

========================

Mike, because you have a random length dipole you already have an idea of
the relative importance of tuner settings. Increasing antenna length nearly
always improves tuner efficiency on the lowest frequency band which, very
often, is the most used band of an antenna.

Don't concern yourself unduly with actual value of tuner roller inductance.
The main problem on the 160m and 80m bands is whether there's enough of it.
If you wish to adjust antenna length to any particular value make sure its
tunable with whatever the maximum tuner inductance happens to be.

Adjusting length of the transmission line can also be of great help.

I mention this hopefully for the benefit of less-experienced readers.
----
Reg, G4FGQ