Hey, I had the exact same problem -> I initialy did a 7 day trial too, thinking that by the time it ends they are gonna forget about their membership, but NO. So I switched to a 3 day trial and sales realy improved since a much higher precentage got rebilled before they had a chance to cancel. And obviously your not gonna charge $10 for it. $2.95 seems to be working.
If you want some quick cash, than just do a 1 day trial, but it's not gonna last for long.
The point is, that 7 days is way too long, you'll have to wait at least 2 month before seeing any results. With a 3 day trial youl start seein results in a week.
Hope this helps...
