I think the operating frequency of the system is high enough to properly deal with the cycling temps, I wouldn't be too worried about it, although I'd datalog it to be 100% sure. It also depends on the placement of the ACT sensor. Mine is located in the lower intake manifold, after the supercharger, and a about 4-5 inches from the intake valve. The WI would inject into the blower discharge, approximately 6" above and before the ACT sensor. It would definitely cycle, as you say, but I've yet to install a WI system to datalog and verify that it's a problem.
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'71 Mustang - C90E 408W @ 9.6:1 CR, N/A
'89 5.0L Mustang: Dart block based 2.2L Blowzilla supercharged combo @ 8.5:1 CR
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