Terrible 1st layer - bad mesh, tape or twisted frame? Vcore 3.1 300

Hi! I've been having this problem for quite a a bit of time: the first layer looks terrible on bigger prints (bigger than a benchy basically), most of the print area is fine but some spots are terribly raised and tend to hit the nozzle causing all sorts of troubles. I also attached the mesh that leads to these prints: it's a bit bumpy because I tried fixing a lightly twisted frame (around .05 deviation) with tape getting to around .02 Belts have just been replaced and have been tightened (the problem was there before as well), IS has been tested, the rest of the printer is stock apart from the FMMM mod This print was in PLA and I had ran temp towers, flow and PA tests for this specific filament and color: prints come out quite good (when they stay attached to the bed) but the quality of the first layer always concerns me Does anyone have any tips? could it be due to something else rather than the mesh or my tape work? will the problem never go away unless I fix my lightly twisted frame?