Hi there, originally the Blast just moved to Tuttle boxes as many customers who use this model are experienced Freeriders who want to also upgrade the fins and use them for long distance races like the Defi Wind et. The Blas is also generally better suited to the more experienced windsurfer who also has more foil experience, as with the narrower outline, shorter length, it is not as easy to learn foiling as on the Gecko. But once you can do it, you do not need such a big board as the Gecko. And the Gecko is only offered as a foil board in the one size because our sales and experience show us that once people are moving down from this size, they go to a Blast or a Sting Ray or any other dedicated foiling size. And in the smaller Gecko sizes, many customers have extra power box fins, especially weed fins, this is why we only stick to PowerBox on the smaller versions.
Indeed, 2019 we did still offer the 120L size, which was selling far less than the 135, in order to keep our range as compact as possible, especially given we now have a full range of Sting Ray foil dedicated boards, we decided to drop the 120 Gecko Foil version. I hope that answers your question?