The crumb looks good on your 1st one if it’s slimy though maybe it needed longer but a lower temperature so it doesn’t get too brown on top. I would say the texture is generally a little rubbery but not unpleasantly so.
Second one looks great on the outside. Did you slash the top? Soggy bottom is strange never had that with tin or dutch oven. You did take it out of the tin as soon as it was out of the oven?
Homemade sourdough will always be quite dense/heavy unless your an expert but i find using a tin causes it to be more dense. In the dutch oven it recreates a bakers steam oven and you get loads of oven spring making a lighter loaf. Another thing i found was making a smaller loaf that it was easier to handle and got a lighter loaf. I think a pro baker gets a really light loaf through their kneading and shaping techniques.