91 Legacy OVERHEATING changed t-stat multiple times water pump flushed radiator if it overheats and if i stomp gas to redline it goes back down bottom hose is cooler than top dont know what to do?

Blown Head Gasket! i had same issue. trust me. and don't have any compression tests or hydro carbine tests done it will show up clean. its weird with Subaru's. buy a junkyard engine and have a backyard mechanic put it in. it'll cost $600 with labor. junkyard engines are cheap. find a low milage one.