How do I fix my Artificial synthetic putting green problems?

I put in a 3/4 putting green last weekend and had a few questions to those that have them. It is a poly green. It is not holding chip shots at all. It is way to fast for chips. The putting is ok, not too fast. My question is will it help if put carpet padding under the green and add more sand? Does more sand make it slower or faster? Right now I have about 1/4 of pile above the sand infill.

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