CNC drilling holes for new aluminum T-Slot bed

Drilling holes on my new aluminum T-Slot bed to prepare for mounting it. Used Peck drilling to prevent drill shaving issues, but am not sure if it was necessary at this depth.

Here is the G-code (numbers are in inches):
G20
(Start with bit .5" above 1st hole location at back left)
M03 (SPINDLE ON clockwise)
G04 P5.0(Wait for spindle to ramp up)
G91 (relative position)

(Start Hole 1)
G01 F20 Z-0.8 (peck 1)
G00 Z0.8
G01 F20 Z-1.1 (peck 2)
G00 Z1.1

(Start Hole 2)
G00 Y -2
G01 F20 Z-0.8 (peck 1)
G00 Z0.8
G01 F20 Z-1.1 (peck 2)
G00 Z1.1

(Start Hole 3)
G00 Y -2
G01 F20 Z-0.8 (peck 1)
G00 Z0.8
G01 F20 Z-1.1 (peck 2)
G00 Z1.1

(Start Hole 4)
G00 Y -2
G01 F20 Z-0.8 (peck 1)
G00 Z0.8
G01 F20 Z-1.1 (peck 2)
G00 Z1.1

(Start Hole 5)
G00 Y -2
G01 F20 Z-0.8 (peck 1)
G00 Z0.8
G01 F20 Z-1.1 (peck 2)
G00 Z1.1

(Start Hole 6)
G00 Y -2
G01 F20 Z-0.8 (peck 1)
G00 Z0.8
G01 F20 Z-1.1 (peck 2)
G00 Z1.1

(Start Hole 6)
G00 Y -2
G01 F20 Z-0.8 (peck 1)
G00 Z0.8
G01 F20 Z-1.1 (peck 2)
G00 Z1.1

M05 (stop spindle)
(Return Home)
G00 Y 12

M02 (stop program)