I'm surprised you even use them with your darker skin tone.
You seem like me in that you might get burnt once or twice in the summer then after it just stays tan.
I'm the whitest I have ever been this spring. For a variety of reasons, I did not hit the tanning bed this winter. I tan easily. I only remember getting a burn once when I was a kid and went to summer camp on Catalina Island. After a couple of days, the burn turned into a tan. Normally. I hit the tanning bed about once or twice a week in the dreary winter months just because it improves my mood. Like you mentioned, I have a fairly dark (olive) complexion.