Nice looking tank. Clean setup.
You've got a lot of light over that system with the MH/T5 alone. I know XHO cuts through MH pretty well. I saw minus9's tank with the 250w and Quanta Meso blues and they cut through more than the xhos when I ran the same fixture. They blended very well with the 14k hamiltons too.
I'd put my money on the Quanta bars; either OG pop or Meso Blues for cutting through best in your system. I have the Quanta OG Pop and when I turn them on with my 10x54w t5 powermodule the color noticeably changes with more blue/pop. I run my spectrum around 14k to mimic my previous hamilton mh.
I'm not sure if they are available to your location or not. Also they do add PAR so you're going to want to ease into it. I don't currently run mine during my t5 schedule. I felt like I was over lighting the tank.