Machinists, how do you guys make use of the 2nd Wildfire that comes up?

When I try out the Stone, Sky, Sea dummy it seems to be better not holding cooldowns like BFB and Hawk's Eye together for the 2nd Wildfire as it will result in lower dps, or am I wrong and I should hold out BFB and Hawk's Eye for 2nd Wildfire? Rapid Fire comes back during that time as well but I will not have any Reload/Reassemble up and definitely not Hypercharge.