Mirage Plus PVS Prop question
 

I'll be running a 24 Pantera with about 600 hp today and need some prop advice. We have a 27 pitch Mirage plus 3 blade with the ventalator plugs. The boat does cavitate a little getting on plane and was wondering if anyone has experience with these ventilator plugs. What are they there for? What should we expect if we remove them? I know the best way is just to try it both ways but if anyone has done some testing with these, I'd like to hear what you came up with.
Thanks
Dave