Your specs look great and -- assuming you had this "telecine" done by someone who knows what they're doing -- it's probably as good as it gets.
8mm film was really a pretty low quality medium. Even Super 8. The camera usually shot through a fixed focus lens. The film stock itself didn't have very good definition. And it's also pretty likely that the film has faded over the years.
I don't know that using any of the color correction and sharpening tools in Premiere Elements will enhance it much. At least not enough to make it worth the effort.
It is what it is.
Because of the grain structure, especially in 8mm (split-16mm), one Effect that I would explore is Neat Video. There is a trial, and I would download and experiment with that. I use it quite a bit, especially for underexposed VHS tapes. After I get the best setting, I will then add a tiny bit of Sharpening. In PrPro, I rely on the Unsharp Mask, but do not think that PrE has that particular Effect. If not, then a very small degree of Sharpening will suffice. Do not overdo this Sharpening.
I also find that Three-Way Color Corrector is useful, but I believe that you will be limited to Auto Color in PrE.
My normal Effects "kit" is Levels, Highlight & Shadow, Three-Way Color Corrector, Neat Video and Unsharp Mask, in that order. One is limited in PrE to just the Auto versions of some of those.
Dennis, please don't post the same question more than once on this forum. It's very confusing.
There are additional comments posted under your other thread.