I have no idea how you managed to achieve a 43.8% W$SD, but I think it's just sample size unless you lagged it up in the first 4K hands for some reason (why is your red line going up so much and then going sharp down?)

your low Agg% and AF seem to imply you're not betting/raising enough
not sure if you should be calling 3bs 37% unless a lot of those are tiny 3bs since a lot of your opponents are 3bing only the nuts