I see.
Well I don't think you can really do anything but add more .measure directives to do this. You can't just copy the ones you showed, because they will always only get the first falling edge. You'll need to add some TRIG parameter to them I think, to get measurements for each next falling edge.
One way to only write the 3 .MEAS directives once would be to use a .STEP directive, and step a parameter for the trigger point (parameters can be used in .MEAS directives). Downside is, it would launch a simulation for each stepped parameter, whereas the parameter would only influence the measurements and not the transient analysis itself, so wasted time. If the simulation is fast, that's an option though to automate the process. (Hope you got what I meant.)