RE: Boom length???
triboard == decathlon. Get a carbon one from them and you most likely wont regret it. If it breaks (within 2 years (here in Spain)) they will replace it (have already done that without any problems with alu ones until I switched to carbon, haven't had a problem since (alu -brand neglible don't last longer than 5-6 weeks of everyday hard use)).
the 2.22 would work they also have a 200-250cm for a little more (DEFINITELY CARBON! ~ 280€)