Hi Andrew,
good to hear your mycelium has been taking off well. 28C is probably a bit of the hot side though, but it depends a bit on what strain you are using. If it is a warm weatehr strain, it may tolerate this a little better than cooler weatehr strains.
The sweating inside the bag is probably a side effect of the high heat, which will increase the metabolisism of the mycelium. What grow bags are you using?
If you were able to increase the air exchange with a few small holes poked in the bag this would help some of the water vapour to evaporate out of the bag. You may also want to poke a couple of holes in the bottom of the bag and hang it up so any excess water can drain out, instead of pooling at the bottom where it may suffocate the mycelium.
It could also be a sign that the substrate water content was a little too high to begin with, so worth keeping an eye on this as well for future bags.
best wishes, Adam
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