Thank you for taking the time to port it and run the numbers — this is really useful. Point 3 hit home: by the last rounds the blast covered almost the whole board, so the choice disappeared. I re-ran your model and got the same numbers, so the new build grows the blast by 5 px per level instead of 15 (72 / 77 / 82 / 87). Even at the max level the biggest chain is now about 32 of 44, so the late rounds stay a decision. Thanks again!