ring gap ?

[speedworxs]

i'm building my engine project,
and planning on 15+lbs of boost.
did the search, and did google search too, does anyone have some advice on what the ring gap should be
according to a Mahle chart, i should be around .02 inch which is half a mm!
...that seems high to me
:
Application *Top Ring *Second Ring *Oil Rail
High perform/Street -Bore x 0.0045″ -Bore x 0.0040″ Min 0.015″
Circle track, drag racing -Bore x 0.0050″ -Bore x 0.0060″ Min 0.015″
Nitrous up to 200 hp -Bore x 0.0060″ -Bore x 0.0050″ Min 0.015″
Nitrous over 200 hp -Bore x 0.0070″ -Bore x 0.0070″ Min 0.015″
Trb/Sprchrged up to 15 lb -Bore x 0.0060″ -Bore x 0.0050″ Min 0.015″
Trb/Sprchrged over 15 lb -Bore x 0.0070″ -Bore x 0.0070″ Min 0.015″
Diesel – Turbocharged -Bore x 0.0060″ -Bore x 0.0055″ Min 0.015″