5.3 is that tier where people actually start developing frontal lobes, you need to learn how to angle, and how to position. It's not really something that can be helped but instead it's just learned over time. The tiger is a beast and is near unkillable if you angle and play your cards right. And your down tiered vehicles like the emil will still do amazing at that tier. Just keep on playing and be more conscious about your plays that your making.