The bridge and saddle on my mate's P90 studio were a bit higher than that, but those are certainly high. I would try re-stringing the guitar with the strings wrapping over the tailpiece. This should get the tailpiece sitting a lot lower and so be a lot more stable. Like this:
I'd certainly try the PTFE tape (thread seal tape). It currently looks a bit like your bridge is leaning backwards slightly and the tailpiece leaning forwards. The tape should help both to be more vertical.
As Andrew says, the bridge can be turned round to give you more forward adjustment. Whilst the ABR bridge normally has the screws arranged on the pickup side, the Nashville bridge is normally seen with the screws on the rear. This also gets the flat side of the saddles facing the neck, which is supposed to be the slightly better orientation.
The top E does look slightly nearer the edge than the bottom E. The easiest solution is to get a replacement Nashville bridge with unslotted saddles and slot them yourself with the correct string spacing. You could use a small v-shaped needle file, but Gibson just use the initial set of strings they use when setting up the guitar, and bang the strings into the saddle with a hammer to get the notches. Whatever way you go, you must make sure the notch goes in the right place.