Jefferson actually had a section in the Declaration of Independence blaming slavery on George III. Adams and Franklin made him take it out.
Yep. You can find his draft online and compare it to the final. Only about 40% of his draft survived the Continental Congress. The rest was either dropped, severely edited, or they substituted their own language.
I think it was the Second Continental Congress as a whole which insisted on removing the bit blaming the king for the slave trade, not Adams and Franklin, whose modifications of Jefferson’s original text were pretty minor.