Chern slopes of surfaces of general type in positive characteristic

Let $\mathbb{K}$ be an algebraically closed field of characteristic $p>0$, and let $C$ be a nonsingular projective curve over $\mathbb{K}$. We prove that for any real number $x\ge 2$, there are minimal surfaces of general type $X$ over $\mathbb{K}$ such that a) $c_1^2(X)>0,c_2(X)>0$, b) ${\pi }_1^{\acute{\text{e}}\text{t}}(X)\simeq {\pi }_1^{\acute{\text{e}}\text{t}}(C)$, c) and $c_1^2(X)\mathrm{/}{c}_2(X)$ is arbitrarily close to $x$. In particular, we show density of Chern slopes in the pathological Bogomolov-Miyaoka-Yau interval $]3,\mathrm{\infty }[$ for any given $p$. Moreover, we prove that for $C={\mathbb{P}}^1$ there exist surfaces $X$ as above with $H^1(X,{\mathcal{O}}_X)=0$, this is, with Picard scheme equal to a reduced point. In this way, we show that even surfaces with reduced Picard scheme are densely persistent in $[2,\mathrm{\infty }[$ for any given $p$.