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					Originally Posted by t_g_farrell  Check to make sure your AP is making a good squirt. It should be part of what helps you get thru that progression from idl into WOT. | 
	
 This is only my second post so apologies if it's a bit premature:
I've been running mikunis/solexes for years on my toyotas.  I love 'em.  What t_g_farrell pointed out is where I would check too: your accelerator pump sizes.
The size indicators can be a bit misleading.  Just to give you an idea a 40 pump jet will squirt a larger amount at a shorter period of time over a 35.  Make sense?  So, it sounds like the progression from pilot to mains could be a lean bog due to either too short of a large squirt or to little of a long squirt.
I'd try going up a larger size though it'll be a shorter squeeze.  It might be enough to straighten out that dip.
It could be balanced with a .5 step up on idles coupled with a step up on the pump jet.