I'll say 60mph @ 2700rm and I go WOT. Although the same bog is through the entire speed and rpm range. Doesnt seem to change if Im going 30, 45, 60 or ??? Same bog
Also keep in mind that the accelerator pump adjustment can affect the engine and make it bog... Have you tried to increase or decrease the amount of squirt by changing the linkage to a different hole on the accelerator pump arm to see if that helps or hurts???