My daughters favorate rod in the yak on bigger fish is less than 4ft long and very parabolic, this allows her to tackle bigger grouper and safely control them to her landing net. In the rivers where pinpoint accuracy is needed to virtually put a lure on the nose of certain species she either uses a 6ft outfit or for even more fun a tiny little 3ft outfit.
For us the whole point of using a yak is that you can quietly get close to fish and don't need to cast any distance, not that the rods we use won't cast a fair way. Most fish we chase can be landed with 10lb braid but for grouper our starting point is 80lb mono. Even using drag settings of around 8lb with 10lb braid in the yak can be tricky on the longer rods, luckily yaks tow well when a good enough fish pulls.