The idle air bleeds sound like is where your problem is .
the idle ones are the outer closer to the out side of the air horn or top of the carb .
The mains are closer inside near the squirters.
my engine always ran leaner at idle when i increased the out air bleeds this is why i suggested a .070in idle air bleed on the primary side first.
.025 is the reason you are so rich if you are sure of the position.
.025 is the main air bleed size for sure.