The Maj7#5 chord works great over altered chords. For example, play the (Ab)Maj7#5 over the 3rd of an E7Alt to outline all the juice notes of the chord (particularly The #5, #9)
Here are a couple diagrams.
first one is the AbMaj7#5 hexatonic
![](http://d10j3mvrs1suex.cloudfront.net/s:bzglfiles/u/779775/1f245717ced8bdfcc3c92f601dda8ada651e6322/original/abmaj7-5-hexatatonic.png/!!/meta:eyJzcmNCdWNrZXQiOiJiemdsZmlsZXMifQ==)
Second one is the same scale but with Analysis over E so you can see the alterations
![](http://d10j3mvrs1suex.cloudfront.net/s:bzglfiles/u/779775/f3990d143323aa70c78f18e6842de91282203738/original/abmaj7-5-hexatatonic-analyzing-over-e7-analyized-e-e.png/!!/meta:eyJzcmNCdWNrZXQiOiJiemdsZmlsZXMifQ==)