1405 lean at WOT

Just something to be aware of with Edel AFBs.....
I have heard of the 750s having the emulsion tubes restricted in the secondaries. Not sure about smaller cfm models, but should be checked. You might want to remove the sec boosters/venturiis & check. Unlike brand H & clones, you won't need any gaskets if you are careful.....
After removing the venturiis, look at the large brass tube hanging out the bottom. If it has a bullet shaped end, it probably has the dreaded small 0.073" hole in it. This small hole feeds that barrel & gets fuel from the sec m/jet. Obviously, if the sec m/jet is say 0.089", the 073 hole controls the flow, not the larger m/jet......as designed. Carb runs lean & nothing seems to fix it....
The fix is to cut off the bullet shaped end. If there is NOT a bullet shaped tip, all is good & nothing needs to be done. Button it up.

Another possible reason for running lean at WOT is a bad fuel pump, either low pressure or delivery or both.

Why Edel did the above is beyond comprehension...............