Don't concern yourself with your English. Just the fact that you know enough to be able to get your point across is a real accomplishment as English is a pain in the neck to conquer.
Anyway, Sweet Perfection is a very good string. It has good playability rating, not so good on durablity, good on comfort and I'd say it's better than average on its ability to hold tension.
If you're looking for a softer string than your current choice, you should be quite happy with it.