I fail to see what is wrong with kurt's former post. The latter it is another thing.
Also what AS said was all good.
Now for actually detailed advice
-use shiny wheels please, you definitely need more kg's for an hybrid like that, there you just won 16kg or such, maybe 20
-if you really want to make a katana popup then attach them directly to the snappers. I suppose you can't do that currently, then snapper load the snappers and attach them when they are up in the air, there you just won 8kg
-It is uuuunnderrrrweiiiiight so make it a dual spinner instead of a single spinner
-samurai swords are pretty damn bad for HS, use razors
-does it have 3 or 4 blacks ? it should be able to work with 3 blacks.
-if you have weight left you can try one ramplate on the front.