Thanks for writing to us.
Looking at your query, I consider that all your wife's reports are normal.
I will suggest you to get examined yourself by urologist
and get scrotal doppler done to rule out varicocele
with his advise. If varicocele is there, you may be helped by doing a surgery, which may help you to improve sperm count
Other option is IUI as suggested by your doctors.
Hope this information was helpful to you.