Hero I done a heap of boards with those angles and never had a bad etch in those area's your nit picking. I've done it using pnp and transparencies and no problems at all. Anyway after i do any transfer I go over the whole thing and if I do see any flaws out comes the ultra thin sharpie pen and any flaws are fixed easily. All the tracks on that board are 0.8mm so theres plenty of area where any joins are.
For Boncuk below, That picture is the photo view feature in sprint layout, it is handy as you can see just how the board will turn out