I personally won't buy any ProComp products and do not find their quality to be in line with the rest of the market.
The problem is they reverse engineer a wide range of products, get around the patents and sell them at a great discount.
The reason their quality isn't on par is because instead of actually coming up with original ideas, they simply steal someone else's. This completely undermines our hobby and articles denouncing such companies, with ProComp in particular pointed out, have been published in numerous enthusiast magazines.
If you have a miss at that low of an RPM, it's possible that your mechanical advance isn't moving properly or is moving too quickly. Try backing off/adding a little timing each way and see if and when it gets rid of the miss. Then you'll know how to curve it properly.