"That said." Usually used after someone has said a bunch of other stuff.
Often after "that said," stupidity follows. I try very hard to Never say it.
How about "Honestly," or "to be truthful," or to "tell you the truth."
So does this mean you aren't always honest, or that you do not always tell the truth?
How about "in my opinion." Who else's opinion would it be? All you are doing is
weakening your argument.