moving it down to .09's would help alot. which is why i prefer 9's, easier for bending and tapping and legato.
high e slipping MAYBE, because the neck is slightly crooked, could try unscrewing a bit and try and get it straight.
Edge should not be parallel, knife edges should be parallel to the body, it should 20-30 degree elevation. check the trem setting guide on ibanez rules for pictures.
http://www.ibanezrules.com/tech/setup/index.htm
not sure about 4, but my edge is pretty stable yet flexible. you could try a different configuration for the springs on the back.
I don't think it'd be worth replacing unless you have the money to shell out.
sticky neck, sand and tung oil !!