Flash profile: automatic or specific?

{ have a Fuji X-E1 camera, the Nissin i40 and the Nikon SB600 Flashes. Flash profiles are available for both these flashes in the V6 II menu. However if I select either of  these profiles, although I appear to be able to program the flash between 1/1 and 1/128 power, when I fire the shutter I only gety a very weak flash.This is irrespective of the power level set. If I ignore the specific flash profiles and choose Fujifilm Auto or Nikon Auto then I can trigger the flashes at a nice bright 1/1 and a nice subtle 1/128.
I feel that the proper profile should be best and I must be doing something wrong. Any suggestions please?
I have checked that Forced HSS is off (though FP shows in Nikon flash window) and that flashes are set to TTL.
Thanks, Eric 
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