I have three comments/issues with that list.
1) The princess needs a lot of live rock and algae to graze on. This is a must.
2) Get the pinktail smaller than the volitan and you should be safe there.
3.) Maybe consider substituting a niger or blue throat for the humu humu because I would hate to see the humu humu rip the lion apart, regardless of the size of the two fish. Besides you already have the white coloration in the sfe, get something blue with the blue throat.