So...did you actually go diarrea? I think that should be avoided, really. If I were you I'd take half the dosage of tea so you don't get cramps and flush all the b&p out of you. The brand of tea I took didn't give me cramps or diarrea - I just would have a regular bm each morning (ropes!).
I took my last B&P last thing at night after my tea...
So you're taking regular Master-Cleanse (measured?) and you're taking it warm? That is totally fine...But I have to say that I just drank all day long. 2 to 3 litres of Lemonade and 2 litres of warm water. The more liquids you have the better, I say! I peed quite a bit, but I didn't get constipated.
Happy Cleansing - let us know how you feel and what you get out!