Excessive condensation is an indication that there is an air leak somewhere. That somewhere is probably the lid gasket, but in this case, it could also be a leak in the collar. Some condensation is unavoidable, but if there is enough to pool up I would consider it excessive. Much depends on the ambient conditions, external relative humidity, frequency of opening the freezer etc. You can mitigate the moisture accumulation with Damp Rid or a similar dehumidifying product. Sometimes you can detect lid seal leaks if you put a bright light inside the freezer, darken the room and inspect the seal closely. It only requires a tiny pinhole air leak to cause problems. Sometimes collars are built less than square and true, meaning that anything more than minor irregularities in the collar where it meets the lid (or gasket) can cause a leak. I use a 120mm computer fan to keep the air moving in my freezer. I run it continuously. The fan probably won't help much with condensation build up. I did notice that my freezer walls ice up much less than without the fan running. A fan will cause your compressor to cycle more frequently, but that can be mitigated by setting a wider differential. I'm currently running mine with a 6*F differential.