1/ I also use the bowline. I have a tigermoth and it really doesn't like wind, on the ground or in the air.
2/ I have always found after securing the aircraft that some healthy size chocks in front and behind the mains will help stop the aircraft twisting in any big gust, also, The other place I see that people forget to tie all to often is the control's. I always tie the stick hard back and align aircraft with the forecast strong wind direction the night before, helps stop been run over when alseep under the wing.
edit
oh yeah and triple peg if on grass.
regards
Ben