That's my read on it aswell, I would add that they may (imop rightly) also believe that oil flow trumps whatever benefits they believe hosting u.s military forces grants. So the closure of the strait and withheld ability to also strike refineries are just as important to moving that needle. The fact those options also take time and would require a pre planed strategy of husbanding resources for a prolonged conflict reinforce the idea that it may Infact be a intentional drop in rate of fire. Or at least partially intentional as attrition no doubt is indeed happening but the degree is imop unknown. Tho from what I have seen Iran has put extensive time and efforts to make that difficult Infact it seems that they expected to be unable to realistically protect there own airspace and planed accordingly.Well it would be the most logical course. If they can't, or think they can't (and therefore don't try) to disrupt the strike campaign against them, then their strategy would have to be to do as much damage to the economy and infrastructure of the region as well as continue to hit military targets where opportunity presents itself. Most of the Middle Eastern states around that area have ties to the US, and are arguably American allies. So in the long run, showing them that following the US into a war like this could cost them dearly might move the needle at least somewhat. And the mounting costs both domestically and internationally would put pressure on the US.
Now how effective those efforts are is the question at least in my opinion. U.s capabilities are afterall extraordinary. Tho in this conflict I do question there sequenceing if not there pre operation expectations. After all I think the protests initial decapitation strikes and potential Kurdish involvement would have been more effective if done in conjunction with these airstrikes not piecemeal efforts.

