I would stop the short sessions as they are just winding each other up and it could end up in a massive fight which could stop any future bond. 30 mins is not enough time to develop a good relationship and these two are not accepting each other this way.
Maybe go to side-by-side bonding - leave them separated by wire mesh for a few weeks. You can swap sides daily after a while to get them used to each other's scent. You may have to take it very slowly.
I'm assuming they have all been neutered for at least a couple of months?
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