I bowled with a very similar throwing lefty in my league, we both had Reaction Revs and then once that ended we would switch to our pearls.
His the RotoRetro Blue, me the Blade Pearl from Hammer. We would stand the same place and keep striking now slightly to the left.
Very similar reaction. The Retro with a touch higher flare had a ever so sligthly sharper breakpoint and I thought I owned the pocket a little better, when we switched.
Too great blue pearl balls.
REgards,
Luckylefty
PS Sorry it is not Roto just thought I'd let you know.