At the highest levels crokinole is becoming a game of centre-shooting. This was evident in the final of the St Jacobs event between Jason Bierling and Justin Slater. There was very little play, mostly centre shooting. The culmination of this came in the final game. Each shot 8 centres (a perfect game to some)
Here are some suggestions to promote discussion. I do not recommend any particular one: I do not know the solution.
1. change the board to make centre shooting more difficult.
2. do not allow "direct centres" i.e. a bounce off a post or disc is necessary
3. allow hiding behind the posts on the 1st 4 shots
4. allow the person who goes 1st to place his shot anywhere in the 15 circle that he likes
I am sure others will have even better suggestions.