Seems like Southpaw has the wrong description for its Zodiac Strength. it should be strongest for Virgo but in actual it was 2x less effective. Just to eliminate the confusion.. Thanks..
To be frank, ALL the stats of Zodiac Strengths and Weakness for every Moga are wrong. The only correct information you get is the description of the Moga, the sign of the Zodiac, and the skills.
Hopefully the developers will fix their Mogadex. But for now, just ignore the stats.