You are probably in the same boat as me...
With the exception I no longer have the excuse of old worn out sails and a beat up boat.. In fact last night I couldn't keep up with old washed out sails with my newer ones..
Can you hang with the guys you were racing when weights are equal?
The good guys were probably sailing right by you.. and you kept moving around looking for something to pull on to make the boat go faster.. and there might be.. but you were probably slowing the boat down more by bouncing around looking for some magic string to pull than you would have gained had you found the 'secret'....
In light air you can't afford to make mistakes.. You HAVE to be a better skipper.. Oh sure.. there might be some little thing you can do to make the boat a little faster.. maybe.. but most of it is in the tiller nut.. I would focus more on fixing you than I would the boat.. unless something is horribly wrong.. I think you are seeing things.. I do this all the time..
I'll let you know when I finally figure it out..
it clicks for me from time to time... but yeah.. uuhhh....