Wheel building for polo

their 2mm steel and i do have a wheelcover but i hate the thing, it just seems like a break a lot of spokes, more than any other wheel i've ever had for polo. is the general rule, lower tension less breakages or are their other factors?

Usually spoke will break at the elbow, sometimes the nipple. They shouldn't break in the middle (manufacturing problem).

If it's an old hub the eyelet can wear creating a larger hole which produces play in the spoke and therefore stresses it until it fails.

A front wheel should be evenly tensioned on both sides. More even tensions are better as a general rule. Hence why on dished rear wheels the non-drive side - having lower tension (60-70%) - tends to brake more spokes.

1) If you break a spoke and keep riding, it will put the other spokes under more strain.
2) If you're rim is warped/bent (not wonky because of uneven tension) and you try to true it, the tension will not be even.