Quick correction there, standard 1oz/ft2 copper is 35 micron (0.035mm, not 0.35).

0.4mm is a bit aggressive, also for isolation routing I’d expect a smaller diameter cutter for any standard 0.1” or less packages. OP, start with a shallower cut.

Some of the traverses are suspicious, but i(blindly) wrote those off as OP playing with settings, looks to have moved to board reference with z at zero, all part of the learning curve. If I’ve been presumptuous then apologies to OP.

Last thing that OP needs a heads up on is that copper laminate is anything but flat. A good first stab is some form of pressure foot to hold the substrate onto the bed, but that assumes a flat and level bed… those need to be established before you’ll get any good result.