Okay, fair enough. The only obvious things I could think of are the turret not rotating fast enough to track the enemy, or perhaps your algorithm is not targetting the centre of the sprite/hitbox, but one of the corners. Anyhow, I spotted a few other things.
1. You cannot chain junctions, i.e. two junctions next to each other will block up the transport of materials. Not sure if this is deliberate or not, but I've had scenarios where this would be useful.
2. Increasing the cost of drills does not prevent drill spamming, just makes the first few minutes of the game a bit of a grind while you slowly build up your stone industry. I think the conveyor and router speed / capacity limitation is a better way of moderating resources, and already works pretty nicely. Ultimately the more you add to the game the more difficult it'll be to balance. The extractors were a really nice addition though.