How useful is it to have two different types of splinter compared to having a fit jump available?
On an auction starting 1H [1S] a 3C mini-splinter sounds like a 4-4-4-1 or 3-4-5-1, which is OK if opener has short spades but bad news if opener has 3 of them. Is the aim to warn opener that you have spade losers?
n.b. I usually play a 4 card major system, maybe the fit jump is more important in 4cM