You're not doing too badly for only 5 reviews.
Also, using the Extended Template and joining the Mentor Program is a good way to get good ratings on your reviews.
There is a breakdown somewhere on where the ratings come from, and they are also related to how every body else is doing.
I know I have written reviews and gotten nothing but "Extremely Useful" ratings on them and it didn't raise my rating one decimal. Other times, one review would do it, but usually not more than one or two decimal.
Log on every day, participate in the forums, write great reviews and join the Mentor Program. Even with all those efforts it takes some time to raise ratings.
In the meantime, enjoy EdenFantasys.