mj wont cut it, you are right about the minimum flow for the chiller not being met. I went with a Mag 7, but have not setup the system yet. I do not know what the chiller head loss is but I figured the range of flow for the chiller was 300-800 and at most the Mag 7 would do is 700, neglecting head loss, so it puts me in the middle somewhere.
A Mag5 could probably do it just as well. Have you though about asking the place you bought the chiller?