You can skip the grind pretty easily with this exploit:
https://www.newgrounds.com/bbs/topic/1035978/725#bbspost23294539_post_text
Thanks to Knuckstrike for posting it. I found it easiest to get "straighten up" type bounces with a low level swingset. That way the swing score will stay below 100 but it's still possible to go backwards more than 25 meters