Everyone has been answering your first question and not the second xD. But I'll give an answer for the first, and then the second. There really is no difference between 14 and 15 pounds today. The make of the balls is becoming so perfect and everything, that you could probably use 14 pounds against 16 and yield similar results. If you are struggling with the 15 pound ball, then I would switch to the 14 pound ball just because your shots will be more consistent, and you won't risk the chance of a possible injury.
Now for the second question. It's really not common for a lack of hook to be because of pin placement. There are normally 3 things that will affect the hook of your ball:
1. The oil pattern that is on the lanes (also includes how much/little oil is on the pattern)
2. The makeup of your ball. This includes where your ball is drilled, what kind of ball it is, the core used, etc.
3. Your approach, timing, swing, release, and all of that good stuff that's all you
I did some research on the Optimus and Punch Out as well. According to bowlingball.com, the Punch Out has a Perfect Scale (hook rating 1-300, where 1 is no hook potential and 300 is insane hook potential) of 175.5. The Optimus, however, has a Perfect Scale of 212.7. I would say the difference between the hook of your balls would have to be that right there. The Optimus is clearly the more aggressive ball. If you feel that you are not getting the hook you want to get with the Punch Out, then I suggest two possible solutions.
1. If you have the money, buy a 14# Optimus so you get the best of both worlds
2. If you are tight on cash, then I would try working with the Punch Out and seeing if you could possibly change anything with your lines/foot placement to make the ball better suited for your style
This is coming from a kid, so don't take my advice to heart and drop $150-215 on an Optimus, but this is what I think. Hope I helped

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