They do, yes. Crude bots are slow and strong, Basic are quick but weak.
We'll be adding more bot types in a later version which will make is less like "hell" :)
In the mean time you can experiment with getting the bots to "Stow" and "Recall" the logs into their inventory which can carry a lot more. Use "Q" and "?" to Stow and "," and "." to Recall.