It may be accurate to say that full length anything is going to ride better
than a spring that is too short. It doesn't matter if the spring is too short
from being cut, or if it is too short when you buy it new.

I go to some trouble to carefully measure a suspension, before I modify springs
so that the suspension is not beat up, to be sure that springs are not flopping
around and that tires are not being eaten up....but people who read some of
my articles, already know that.

If you want to know what a spring rate is I can tell you. For people who
don't have the ability to check a spring, the rate is unknown.-Bob

Loren and I agree that your car looks good based on your photo, and if
you like the way it rides and handles, don't mess with it. Be sure to get it aligned.

Based on the photo (without measuring) I believe that a taller and wider tire and/or larger diameter wheel will have clearance problems. Be sure if you go with taller/wider tires and/or larger diameter wheels, that you let us know your findings. Facts and your experiences are always better than our opinions.

A real heart breaker is when someone brings tires/wheels to me that are too tall and
too wide to clear, and I have to tell him that he should have lowered it first....so
you did things in the right order by lowering it first.-Bob