Buy a BOX of every .22 ammo you can lay your hands on. Try it all - see what works and shoots best for you. Don't buy any bricks until you know you'll be happy with it.
Once you know - and every rifle and conversion kit combo can be QUITE different, you can decide what to make your go-to ammo and stock up on.
If you don't like the price/performance of the ammo that works best, or you can't find any ammo that works well for you, then you can move into adjustments and tweaking.
Should the latter occur, please repost with more information at that later date.