The GS and XLT are fine lines; however, they are very long belly lines with bellies of 90+ feet. They are great for fishing from 50 feet out to as far as you are able to cast them (well over 100 feet for those who have learned how to cast them).
That said, they will frustrate you if you try to cast them 20 to 50 feet.
Perhaps, you should look into the new RIO Scandanavian Head or the RIO Skagit line. The Scandanavian line has a head of 44 ft (11 feet shorter than the Windcutter), which should be more in line with what you are looking for to cast 20 to 50 feet and still be able to cast 100 feet when needed.
The other alternative available is to get an 8/9/10 Windcutter with interchangeable tips and take out the mid section (tip 2). This will provide you with a sharter head line that will have sufficient weight to cast on your Sage 7141 at short distances.