Is that derailleur rated for the size of sprocket you have there? It looks too close, but also wound back pretty far. Maybe it's just because the chain is at the limit, could do with a couple more links if that won't make it too long for small-small. Or just don't use big-big, or indeed small-small. But it's nice to have all the gears, just in case you go there. Sometimes the front doesn't shift cleanly under load and you need to push hard to keep going ...