This design of dry manifolds does present this problem frequently - they were never intended to uniformally distribute fluids to all cylinders.
There are a few solutions:
The one you have proposed.
Move the jet further from the throttle body to permit more travel distance to improve the distribution of the mixture.
Put the jet in front of one of those cyclone induction inserts - while I question its other claimed benefits - brad has said it improves mixture uniformity very well in dry induction systems and it makes sense.
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