im not sure but would the 5th line reduce impact damage when unhooked ?
and at your level would you suicide it or 5th line ?
i hope you choose a c4 . im very happy with mine

the middle bridle settings are quite different .
but havent tried the steer lines yet
you should try my ion 4 ? am enjoying it now as im flying it in stronger winds . that has helped it relaunch . 8.5m in 20kn ish now .
more grunt than c4 but a bit slower speed . quick turns .imo