I have a 1.5 x 2.5 tarp that has 8 tie out points, one in each corner and one in the centre of each edge. I almost always set it up A frame style but if it's windy the sides are easily blown inwards so I was thinking of adding some extra tie out points, but where? Along the ridge line to tie off to a tree or run a guy line along the ridge between the poles or in the centre of each side to tie off to the central pegs? What do you reckon?

I'd sew 2 on each side, 400mm up from the bottom edge and 750mm in from the outside edges. Putting them there will support the 'walls' and stop them blowing in.

You could cheat and use grip clips if you wanted, then there's always the option of moving them if need be.

Thanks Stu, had an idea you'd be the one answer, and with specific placements too, top man.