We investigate a variant of the parabolic Anderson model, introduced in previous work, in which an i.i.d.\! potential is partially duplicated in a symmetric way about the origin, with each potential value duplicated independently with a certain probability. In previous work we established a phase transition for this model on the integers in the case of Pareto distributed potential with parameter $α> 1$ and fixed duplication probability $p \in (0, 1)$: if $α\ge 2$ the model completely localises, whereas if $α\in (1, 2)$ the model may localise on two sites. In this paper we prove a new phase transition in the case that $α\ge 2$ is fixed but the duplication probability $p(n)$ varies with the distance from the origin. We identify a critical scale $p(n) \to 1$, depending on $α$, below which the model completely localises and above which the model localises on exactly two sites. We further establish the behaviour of the model in the critical regime.