first there was the JP SLW90, right ??
wrong !!
the first Formula boards were narrower than the current 100 cm
the BIC Techno Formula came out in 2002 and was 93 cm wide
it was a trimm fin first and eventually tuttle and then disappeared
great board , but top speed limited
still show up in used market for reasonable price !!
THEN there was the JP SLW90 in around 2010
and I believe the SLW92 came out BEFORE the SB UltraSonic/US 147
then there was only ONE SLW91 in 2015
Also, around 2015 there were Fanatic Falcon 152, Tabou Speedster 89, RRD X-Fire LightWind 150 and the Exocet RS 6.5

and if you can't afford one new, get one used !!
just have to be patient and keep your eyes open ...
AND i believe the recent success of big, wide , early planing boards led to the "free-move" board development