Minor issues with "Rectilinear" infill pattern  

Minor issues with "Rectilinear" infill pattern

Dear all,

Please take a look at the following model infill (15% "Rectilinear"):

One can see the following:

• The way the infill is printed is not uniform: the walls are followed by empty spaces (highlighted with blue) and sometimes generates 1-2 layer bridges (highlighted with orange). Not a big deal, but that might impact the model strength.
• Infill generates some strange loops, and sometimes these loops hang in the air. I believe these loops and curves are the "echo" of the model from upper layers which somehow is "projected" on the infill (highlighted with red):

• Infill anchor does not touch the perimeter (highlighted with orange).
• Just for my information:
  Why so much solid infill is generated (highlighted with pink)?
  What prevents the infill pattern to be connected directly to the perimeter?

"Aligned Rectilinear" has similar issues, "Line" creates a messy pattern, other patterns are more or less OK.