That uses the original 6108507200 27 ohm smoke unit. Usually 20 drops would be a good start however many would say to use much more. Most likely the batting material is charred so much that it doesn’t absorb the fluid anymore perhaps allowing the fluid to run all over the unit making a mess. Search the forum for repairing smoke units and you will find new/improved packing and how to install. I guess your wheel spin could be coming from spilled fluid getting down to the wheels. Rebuild the smoke unit and dry off the exterior and hopefully you’ll be back in business.