You are doubling the intensity or at least the wattage (I'm not sure if 2*wattage = 2*intensity, but nonetheless it's a jump no matter what the relationship is specifically) so an adjustment period is to be expected. The best way to acclimate to a new intensity is to ramp it, which could involve either raising the lights (which I know you said wouldn't work, but still, I mention it because it's there). Another option is using layers of eggcrate that you remove one by one a couple days apart.
And then my personal preference which is just to keep the photoperiod but go in bursts. Let's say your photoperiod is 10am to 10pm. You keep the endpoints the same but you adjust the timer to do 15 minutes on, 45 minutes off. Then 30 on, 30 off, then 45 on, 15 off and then finally all the way on the whole time. A couple days apart between adjustments.
Or you can hope to heck that the corals just pout a bit but eventually recover. Which could work sometimes but I imagine it's the riskiest approach.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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