G41 ISN'T for "climb milling". although for almost all applications it ends up being true. It's "Offset Left of Geometry" If you're working in a CAM system, you can compensate for the radius of the tool there, or at the machine. You've probably let the CAM system compensate for the tool there, and gave a specific diameter for the tool to be used. You could have specified for the compensation to happen at the machine, and chose any number of tool diameters to work with. The entry at the machine for tool radius would have been half the diameter, of course. OK, so you've chose for the CAM system to generate the pass based on a tool diameter. Taking out the G40s means the machine is continuing to compensate for the tool radius (now zero or close) but the errors are miniscule, and probably even non-cutting. Change to a sharpened tool, where your offset value starts to get larger (-.030?) and your G40-less contours start to gouge your part. because the machine is still compensating to the LEFT of the line which was supposed to be non-cutting. I'd leave them in to be safe. It doesn't hurt, and is what you've asked for your CAM system to do.