I think that the EX ferra throws being Vicious-exclusive is a great idea actually. Here's why:
Overhead/Low toss off of any string is not a mixup. It's always fuzzyable. The overhead is strictly for hit confirming strings into a launcher, which ruthless can already do meterlessly, so it really has no use for the EX overhead. The low is for extending combos that are already airborne, giving outrageous damage to ruthless which it does not need, but it would be fair in Vicious since it does not have a damage buff.
B121 into f2 being a viable hit confirm, along with better hit advantage on strings and 2f4 PnG setups are already more than enough to make Ruthless very good.
Vicious, on the other hand actually needs these EX tosses because without them it cannot hit confirm into launchers, and being able to extend combos with EX bowl girl for a bar (giving him 40-42% 1 bar) is fair for this variation since it doesn't get run cancel pressure or damage buffs. The EX bowl girl would also be a good neutral tool to make Vicious' neutral space control scarier.
What do you guys think of my reasoning?