I do not know when I have said to anyone that Krsna should not wear anything black color, nor I know where I have given any permission to wear black color, but there is no harm if sometimes Krsna dresses something black. Sometimes in Vrndavana they dress Him in black.
Yes, the leaves of Srimati Tulasi Devi may be offered to all Visnu-tattva expansions of Krsna, including Nityananda and Balarama.
You may dress Lord Caitanya in the standard way, main things is do it nicely, don't make it funny. In your Western countries Lord Caitanya should be entirely covered, He should not appear bare-chested.
Why you are pouring water over the head of Radha and Krsna deities? Big deities should not be bathed in this way, using water or other things. Rather they are bathed daily by mantra, do you not know these things? Under no circumstances shall we bathe the Jagannatha deities with anything water or liquid, they should be bathed with mantra also. Now you are asking if Lord Jagannatha carries flute? Why this nonsense question? You are asking me so many concoctions and manufactured nonsense. Don't bother my head in this way any more. From now on unless I order you do something change or in addition, go on with the usual standard way. You manufacture ideas and then I have to waste my time. I have given you everything already, there is no need for you to add anything or change anything. Why you are asking these things? Who has given you such freedom? Pujari should operate entirely under the supervision of temple president and GBC, not independently. The greatest danger to our movement will come when we manufacture and create our own process for worshiping the deities. So don't ask any more new questions, whatever is going on, follow it just to the exact standard as I have given you, that's all.