I commend an excellent post that was beautifully researched.... first.
You alreayd did every thing pretty much needed, i tell members to get a motorvac and an inline tranny filter which should make the tranny stay bolted to the engine for a long time since the oem metal screen mesh is useless.
I don;t agree with 87 octane , i always see lower mpg on all 3 of my cars with anything but premium.