My ballpoint pen fix
Ballpoint pens mimic the good old pencil. The benefit is clearer lines, clearer scans, clearer thought process. Also you get way faster. Of course you have to practice your profile sketching and perspective views, and in this case I think blending pencil and pen use is okay.
Currently using
Pilot Easy Touch (bleeds a little but fun mistakes)
Pentel RSVP (fine) does not bleed and great for super light sketching.
Sharpie's Sharpie's Sharpie's (test them all out)
Sketch ON !