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powersloshin said..
after a few sessions the big sail will feel a lot easier, should also propel you upwind better. Are you using long harness lines and keep the boom reasonably high?
Yep.
Big sails is mostly mindset, many people hate them yet young folk sail(ed) with comparatively huge & heavy techo & rsx rigs.
There is a big difference between formula & big slalom or even the big lightwinders slw/ultrasonic etc. But your gear should be fine as the 9.4/85w/50 fin should be well balanced if not fin a bit too big. It should be better than your 7.7 because as you said you can plane through the lulls. Overdownhauling could be another cause (easy to do with big sails) or are you sailing a spot with lots of current & relatively low planing speed compared to 7.7 causing you to lose ground? Also because of extra weight you can try pulling mast foot a bit further back.
If you muscle big rigs to wrong position they will punish you with extra effort & slow speed. Give them a bit of finesse & let them do their thing/find their sheeting angles they are fun to use. Only downside I really notice is if not powered up have to be super careful in the gybe or they'll stall the rail.
9.7 is my most used sail each year & it's nice stepping down to 8.6 which then feels small, I foil also but i'd never not have big slalom rig.