Those levels are great for D IV and pretty good for D III. Those should also be good for Motion, Princeton, etc. The hard part is going to be stopping players from 3-2-ing or 1-3-1-ing you every game. Either way, you should still be a good outside team at your level.
Also, for the slower offenses, passing becomes important, especially on your bigs. Some JS and JR wouldn't hurt either (but probably doesn't need to be more than 6 or 7 for D IV). I would recommend at least 8 or 9 passing on you SG and SF and 10+ on our PG (even more in D III). In slower offenses, it becomes more important to find open shots and passing will help you find them.