If it's fast, you can scout; it gets you a fair bit of xp. It might be a similar grind to that of the Pz38 NA to the Pz IV, which legitimately sucks. I think Tier IV has it the worse.
I'm also at the A13MkII and am getting frustrated by my many deaths. I chose that line because it led ultimately to the Comet and Centurian, but if WoT is right, the Brits sure seemed to have clung to the fast/light scout tank idea longer than anyone else. I am a slow, deliberate, ambush player by nature, which makes me dead meat in light tanks. Hope a British TD line appears soon.