Drill small holes in your tent support poles(I have used a 4mm bit)all at the same height....then secure together a bendable pole about 20mm longer than the distance from front pole inside, to back pole inside....for this I used bamboo cooking skewers, cable ties and electrical tape.
insert each end into the holes, front to back and let the pole bend outwards....pushing your tent outwards, gaining room in your tent and the convexed sides aid air circulation!!!
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apologies if something like this already exists......