I have the MOJO in seven weight. I had Steve Worley ask St Croix about line recommendations.
Their reply: Sonar Titan full intermediate is what we like the best, 380 for the 9, 330 for the 8 and 280 for the 7. You would not be exceeding 80 with these weights, but great for 40-60
So far I have the sonar titan floater in 280 grains. It throws big poppers and heavy streamers pretty well.