As previously suggested, try to find some time for conditioning and getting accustomed to the Quattros before spending the money on new split fins. The Quattros are arguably some of the best fins on the market. I put spring straps on mine
Mares Stainless Steel Fin Spring Straps 415348 with reviews at scuba.com, wear them with Seasoft Sunray boots
Seasoft 3mm Sunray Titanium Heavy Duty Low Top Zipper Dive Boots SRB with reviews at scuba.com and really love them. The solid sole boot is key to preventing cramps with open heel fins because they cause you to engage your larger thigh muscles rather than the calf and foot muscles that can easily cramp. I dive at least twice a day, six days a week and love my fins. If Caribbean, 100ft viz, no current diving is your norm it may be hard to appreciate the Quattros but once you find yourself in a strong current and/or needing to get somewhere quickly underwater the value of these fins is obvious.
Not intended to be a commercial for Mares but just don't like seeing people give up on quality gear when some minor fixes could change the whole feel of it.