Pin Slasher, although discontinued you might find one, (same core obviously, very low RG) although the cover not super weak, not super strong either. Pin Slasher a little more angular than the Game Breakers. Furious by Storm might be an option, little higher RG though and little less diff so will be longer/more angular with same layout from the your GB. Your trying to replace the pin down Game Breaker and get the same ball motion or are you looking for a slightly different ball motion? Asymmetrics roll totally different so that could be an adventure for you coming from a GB, lol.