Won't float over void

[Voldorius]

I've recently loaded up a world that has multiple floating islands on a server i admin for, i then installed this plugin for easy transport between islands, i've half fixed the issue of the ships sinking downwards to an inevitable demise by having a command block rapid-fire and replace air with tripwire at Y=2, but the ship will only float at 52 maximum, is there a way to increase this as the islands are between Y=150-210

[Voldorius]

filling with string at the value of 150 is not an option as it will fill into the caves and will become exploitable for free string and therefore wool.