The FX Synwax (paste and liquid) contains cleaners, so it might not be the best idea to put it on top of the Klasse twins.
+1 to this, though the cleaners in FX Synwax are milder than the Klasse AIO, it's either you use FX Synwax or Klasse Twins (AIO + HGSG), and top it with OCW as your LSP...