Tried Rakza Z on a Harimoto Innerforce ALC and, with that blade also throwing high, the arc was definitely too much for them; they dislike Rakza Z's high throw on the forehand.
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Played Rakza Z for several months among many rubbers (Rakza Z EH, Dignics 09C, Battle 2 and 3, Hurricane): a good one if you accept it is worse than Tibhar Hybrid K3 in everything except durability; they chose K3 despite its durability.
Started with Rakza Z and found it a good starting point, but recommends G-1 over it: Rakza Z has no tensor effect so all the spin comes from your body, which is rewarding at the right level, while G-1 is easier on the body.