So I've just built myself a pulley system for my boards to raise them to the roof as I have too many other toys and need the space for more.
It works great with one board but with 2 on the frame its a struggle and it really shouldn't be.

Can anyone suggest what the problem might be?

I have single pulleys on the frame and roof, double where the 4 lines join to 1.

I'm not sure if its a pulley friction problem or bad setup , only thing I was thinking of was move the doubles over to reduce angles and maybe doubles on the the frame and roof but for the weight they shouldn't be necessary.