Concerning the Vipers, they sailed the 104 rating,
Gill
" Barely 120 kilo dripping wet, the catamaran lightweights excelled in a variety of conditions to claim the 16-foot division " ( B2 blurb )
And that is the problem for handicap systems, penalise the light boats but make no allowance for the very light weight crew, something SCHRS should be capable of dealing with relatively easily