Reducing memory footprint in use of FullSimplify ?

Hi

 I am carrying out a large symbolic calculation (lot of FullSimplify and
Simplify statements for about 160 expressions). I am using MemoryConserve
(switched it On), making liberal use of Share[]; and Clear'ing some of the
variables as soon as they used the last time. However, my calculation is
maxing out at 260 MB and crashing the kernel. Are there some other ways in
which I can reduce memory usage ?

 I have noticed that the memory usage goes up dramatically when I use
FullSimplify and assign the expression to some variable. However, what is
puzzling is that that memory is not freed once the operation is complete.
Is there some way I can force Mathematica to free up memory on the data
stack (I am currently setting the unsimplified expression to zero as soon
as it is simplified and assigned to another variable) when it is done with
an element ?

Thanks.
.

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