For those who might be in the long haul while saving up for the SF UL.
The SF's tail weight is integrated with the leech-line nock, so it is not so easy to immediately remove this weight if the wind gets low (and you don't have an UL). I made a replacement tail nock, but with one inch of carbon to slide it into the spine, rather than four inches of brass. Combined with taking the upper spreader out, this cuts around 25 grams off the kite, allowing a little lower wind range at the price of balance, impulse and structural integrity.
The kite becomes slower to trick, kind of a little less flat, unsurprisingly more difficult to wrap, but on the whole quite good to fly. Certainly more leisurely, you can watch the kite and respond to its position, rather than the normal SF tactic of having to learn when inputs happen; the SF doesn't give much visual cue for plenty of tricks (see tazes and cometes). I thought fades would become too flat and less stable, but they are actually really very stable.
I made a small handful of these tail nock + carbon insert - if you PM me your address I'll send one out, no charge incurred. First come first served, UK only please. **out of stock**