Dan,
I (actually, my son) am growing 300 plants in 5 gal grow bags.
Based on the advice from a local commercial greenhouse grower, I switched from an all peat mix to a mix that contains peat and bark fines. The bark actually helped the water soak in more uniformly. The problem I had with all peat is that if it dried out the water would run down the perimeter of the plant and not soak in. I have had much less BER this summer and it has been one of the hottest on record here.
You definitely must water consistently. Especially with your BX mix.
Temps here have been in the low to mid 90's every day the past month. I have had to water twice a day for 10 minutes each cycle. I am using netafim spray stakes.
Good luck,
Bill
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