As a precision reference, here's the 1e5/2e5 answer computed with my program. It ought to be good for 60 digits:
[thor@redwood fishers-exact-test]$ cat fetbig.dat
100000 200000
200000 100000
[thor@redwood fishers-exact-test]$ time ./fet <fetbig.dat
+1.324994596496999433060120009448386330459655228210366819887079e-14760
real 21m8.445s
user 20m56.788s
sys 0m6.831s
It looks like your FET6 yields about 13 digits of precision for this case:
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1.32499459649680040e-14760
+1.324994596496999433060120009448386330459655228210366819887079e-14760
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