What put you on TRT at such a young age?
Why on earth would you have to throw it away? If it's in a vial it's good to go. If you mean an amp then buy some sterile vials on-line and transfer it.
If you're 840 on your lowest day (assume pinning once per week) then you're about double that the day after your pin. Look below:



If you pinned a lesser amount twice per week, say 75mgs every 3 days or so you'd probably have similar numbers with steadier levels. You'd also stock up.
You would also have less of a spike in E2 as well. If you stay on the current protocol you should run labs two days after injection sometime. Be interesting.
Are you on HCG?
Do you need an AI?

Only real health concerns would be polycythemia. Monitor your Hemo and Hema.

Glad you're feeling well!