Regarding the internal stringing - that's normal. And from the video I can see that many of the travel moves are right towards the spot where you are underextruding. You can reduce this by keeping the travel speed fast (it's at 150mm/sec right now - you can safely go even faster to 200mm/sec) but more importantly print slower and colder. This way the nozzle will leak less during the travel moves so that there will still be plenty of plastic in the nozzle for the outer shell.
Try 25mm/sec print speed and 190C temperature. I'm not sure that will work but I think it will. That's what I would do to try to get rid of those underextrusion holes in the side related to non-extruding moves.
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That's a very very good bottom layer. I think you can do better. I don't think I've done better - well actuall I know I have in special case (call me gr5, not "moderator". There are other moderators).
First of all to get leveling better you can't do it with leveling procedure - you have to do it by printing bottom layer and then adjusting screws. However you might already have it perfect. Anyway the trick to getting the bottom even better is to print it thinner. By default the bottom layer is .3mm because that makes it easier to get the bottom really good. But if you want to eliminate the lines even more then make the bottom layer .1mm. But now the leveling will have to be even better. While the printer is printing the skirt consider adjusting the 3 screws a little bit - I think you want it slightly closer. Alternatively you can adjust the flow. Maybe set it to 110% for the fist layer and then back to 100% some time during second layer.
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