Lancer, this is somewhat tricky of a situation to address - so I'm going to unpack it the way I'm reading it and then advise (that way if I have some information wrong you can correct me).
You are bowling on dry, wood lanes (which I would expect to cause early roll rather than too much late reaction), throwing plastic and/or urethane (plastic would create a lot of late reaction, but urethane would typically cause early reaction), and you are lefty wanting to play up the 5 board.
I'm assuming that the carry-down reaction causing your issues are later in the block so you would be getting the benefit of the good reaction with plastic early and issues later in the block. Which would advise that you move left after the carry down and try to get around the carry down spot.
In regards to other equipment, you are really not going to get anything that reacts similarly to plastic - unless you purchase more plastic. What I'm missing is what the end goal of this is - are you trying to find a ball change that allows you to stay up 5 after you have the carry down issues? From the limited information my honest advice is that you are going to have to move when you get the carry down issues, by using plastic at the start on this line you don't have a step-down option. The other thing that leads me to this is that you are throwing urethane up 5 and it is reacting too hard on the backend (typically urethane is a very arc-centric reaction and I wouldn't expect backend reaction, especially on wood lanes), it just sounds as if you are going to throw anything other than plastic you are playing the wrong part of the lane.
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