Help with Arimidex and Low E2

[schwartzy]

I just got back my labs and I'm concerned about my E2 level. I've been steady on the following for at least 8 weeks:

Test-E 55mg 2x week (110mg) For way more than 8 weeks
HCG 250IU 2x a week
.25mg Arimidex every 3 days.

The lab results are as follows:

Total Test: 1093 (250-1100)
Free Test: 195.9 (35-155)
Estradiol: <12 (<43) <<<<<<<<<<<<<<<<<<<
Prolactin: 5.6 (4.1-15.2)
FSH: 0.6 (1.5-12.4)
LH: <0.1 (1.7-8.6)

I'm concerned about my E2 level. It's obviously WAY TOO LOW!!!! I never thought that only a total of .5mg a week would cause it to crash. Still seeking the sweet spot of around 20. I'm trying to see if I should stop the Adex all together, up the TEST dose, or try .25mg once every 6 days instead. How long before it comes back up? How will I know when/if I need to start taking it again? I won't have more lab work for at least 4 months, so I'm seeking your advice on how to approach this situation.
BTW, I was thinking of increasing my Test dose to 150mg a week for a little extra boost.....What do you think?

Thanks in advance for all your help.....
And Thanks Zyg for your reply.....