Phugoid expectations.
A phugoid in pitch with stick fixed or controls locked will usually have a lengthy period exceeding a minute. If there remains something that can be imposed on the phugoid such as changing thrust then the phugoid may be altered. But the problem is at what stage does one insert the change. It is unlikely to be instinctive and the odds are that the change will be initially inserted at the wrong time thus magnifying the amplitude. Given enough time one may get close to determining the optimum time to insert the change to dampen out the phugoid.
If one is able to increase the pitching stability by moving the cg forward with fuel transfer or pax movement one could expect some degree of reduced amplitude.
There will likely be a particular average IAS where the phugoid will be around a level altitude.
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