twostroke,

You did not say how much the chord is too long to fit in.
It is odd that the manufacturer would supply a jig that is too short.

I would build the washout. The model without washout flys nicely until it approaches the stalling speed. That is when you will appreciate the washout. Many fliers never come close to the stalling speed Like some fellows fly at full throttle all the time.

Half a penny's worth.

Zor