To cap the ROF, and still use the eyes, you can use either the COFF, or CDEL settings.
A high CDEL will help to limit trigger bounce a little, but the trade off is a longer over all cycle time. A high COFF time will make the gun seem more responsive, but it will place the delay at the end of the cycle, while a high CDEL is make the over all cycle, from the ball leaving the barrel to the bolt loading the next shot, longer, but may be easier to keep a steady stream of paint going.
If your total of CDEL, COFF, and CON equals 67, then your max ROF will come out to 14.92 bps, so that's the number you want to aim for.
Turn the eye off, and slowly turn down the CON time till it chops every ball. Use that as the shortest CON time when you calculate your ROF. Make sure you have fresh batteries in your loader, and your gun.
So, say you are chopping at a CON of 35. That leaves the other two to take up the balance of the time to limit the gun to 15 BPS.
Figure 28 is the FF setting for COFF, so leave that one alone, and make up the balance with a CDEL of 4 to hit the 67 magic number.
If your CON has to be higher, say 40, your COFF can come down to 23, while the CDEL stays the same, and you still get the below 15 bps settings.
A lower CON time will require an increase in either or both CDEL, and COFF.
As long as you have the CON set to chop, and the other two numbers bring the total up to 67, you should be fine.
Play around with the balance between a high COFF, and CDEL to find which you prefer.
Also, since you won't be running some super fast, beat the hell out of all the parts in your gun, setting, there is a nice side effect. You can lower the LPR setting by using a higher CON time, and using that to mitigate the overall impact of using long COFF and CDEL times.