yes, this might help. If I read your post correctly, you want to speed up your clip to half it's original speed. select the clip in the timeline and go to clip: speed/duration and change the speed to 50%. and change the frame interpolation to optical flow.
Hard to predict how great it will work, but it can be amazing. Sometimes adjusting the speed change by a percentage or 2 can make a difference. Also render times can be lengthy..