Well lethargy is a common side effect with 1-andro. I've experienced it by running a cycle where I didn't start the 4-andro until beginning of week 3. But I within 2-3 days the lethargy was kicked.
My suggestion would be to up the 4-andro by max 100mg, or throw in Epiandro at 600-800mg every day. Epiandro will most certainly kick the lethargy and more than likely give you extra energy, libido, mood, etc.