He's done surprisingly really well. I usually prefer to have a target man if I use a loan forward, and Armstrong is certainly not that. But what I've done to adjust is that when he's up there by himself I instruct him to drift wide and I am able to get him running at the defense from the wings a lot usually with just 1 man to beat. It's been pretty effective so far. I haven't tried him as anything other than a striker at this point but maybe it's something I will make a note of since I'm always tinkering in this career mode anyway!