It might be worth briefly and slightly opening the container after a few days in order to eqaulise the pressures. This will of course admit more air containing more oxygen, but a large enough oxygen absorber should absorb this as well as the first lot.
After the second and final sealing of the container, the pressure within will again drop as the oxygen is absorbed, but this time by only about 4% rather than by about 20%.
The effects of this may be minimised by finally sealing the container on a very cold day, or after storage in a refrigerator.
Perhaps set off the heat pack and let it run for a while before you put in into the container ? If you let it run for (say) 2/3 of its rated hours before you seal it in, you may get less pressure.
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