Hi Neil and all, hope its not too late but the lines you describe sound like a power kite set up, I use 38 dan ( 80 lb climax purple ) or mostly 25 dan ( 55lb climax orange/pink ) and same strength top and bottom, this is recomended by fliers with more experience than me.
Despite my other posts re., handles I would go for rev extended, I have standard rev handles spare if you want to try them.
Fungus ( see you sunday )