I use 4 stake-outs - okay up to 30 MPH - but I tend to choose sheltered locations and only 5 feet tall
Probably 8 stake-outs are all you need
Easy enough to add guy-outs - mid point - on all 8 ridgelines - grosgrain loop sewn through the flat felled seam
I have Easton Aluminum 0.625 inch - way beefier than necesary - they haven't seemed to be stressed very much in the worst weather. I recently got some 0.433 inch which I think are sufficient. So, for your tent 0.625 is probably all you would need. But, this is a little light, you might find something a little heavier is better.