143 spins at GHQ gave me:

Triple Pero 20 times (14%).
Triple Chance 52 times (36%)
Triple Exp 29 times (20%)
Triple Gift 37 times (26%)
Nothing 5 times. (4%)

Just looked at the Girls cards I got shown at GHQ:

287x N-Girls (92%)
22x R-Girls (7%)
3x SR-Girls (1%)
Total 312 girls

Normal area spins (fx 5-3)
790x N-Girls (76%)
206x R-Girls (20.5%)
36x SR-Girls (3.5%)
1032 girls

So Chance for SR and R girl form a triple chance is 3 times bigger at area 5-3 than from GHQ.
Maybe both GHQ and Bonus Stage both sucks.

Bonus stage 217 spins:
Triple Pero 13 times (6%).
Triple Chance 15 times (7%)
Triple Exp 12 times (5.5%)
Triple Gift 12 times (5.5%)
Nothing 165 times. (76%)

49x N-Girls (55%)
37x R-Girls (41%)
2x SR-Girls (2%)
2x Wilds (2%)
Total 90 girls/wild

Triple Chance seen to give Little bette drops from Bonus Stage than from 5-3. Area 5-3 gives 4 time more triple Change for same stamia which more than ofset the Little better chance for a R-girl and maybe SR-girls.