Decrease single-player difficulty of horde wave

I think the horde mode is too difficult. I think I had the best preparation I could have (at least for the 1st wave) and I still did not have a chance. I built a concrete box around the vapor condensor. Around that, a ring of medium hedgehogs. And I was standing on the box with a hunting rifle and the pickled carrots "+20% Projectile Damage" bonus. As far as I see, that is a reasonable defensive setup, at least for a first wave? It is more defense than I have ever built in the game. I got a some wolves (+ alpha wolf), then some jaguars (+ black jaguar) and then some bears (+cubs). I think this all belongs to the first horde "wave" since the condensor did not contain loot in between. In the end, I was shooting bears as fast as the hunting rifle could, but it was not enough. There were like 20 bears around the box. So, I think the first wave of the horde mode is overpowered (for single player?). Otherwise, which kind of setup would be appropriate for the first wave of the horde?