I'm glad to answer, Bella, even though I'm frustrated that I haven't lost weight and have only been on Symlin for a little over a month, so I'm no expert. But I found that there is so little information out there about it!
Well, I didn't go about it the same way, it sounds like. Because that is what I had read to do (and worried, unnecessarily about lows), I just automatically lowered my insulin by about 50%. Then I just kept track of the results. I test at four hours now due to the slower spikes. For the first few weeks I wasn't in target range for even 1/2 the time, so I guess that is the same as your needing more (or the same) insulin. But I just kept doing it that way despite the highs so I could experiment with different dosing regimens.