I'm finding in most strong Assymetricals we are seeing the "strong" position of the MB in the 5" to PAP range and about 3-3 1/2" from the VAL which puts it closer to the thumb or almost on it for players with axis coordinates in the 4 3/4" - 5 1/2" range.  

These new assymetricals are so strong and spin up so quick, a strong MB placement will negate any type of length you're trying to achieve with the pin placement(if you go high above the fingers or at 5+ inches from the PAP).  

I've drilled two Epic Saga's which both spin up in the 5-5.2 second range.  One has the "Trick Layout" in it.  The pin at 4 1/2" to my PAP and 1 1/2" pin buffer distance and the MB 5 1/2 from my PAP which lands on top and a little left of the thumb.  Then I have one drilled pin 4 1/2 from my axis under the bridge and the MB at 60 degrees("strong" position) which lands about 2" from the VAL.  

Guess what....Ball #2 wants to spin up quick and lay off in the backend, ball #1 goes about 6 feet longer and makes a dead left move out of the friction.  Yet in a weaker assymetrical ball(ex. TPC Warrior), the same drilling #2 yeilds a sharp change of direction and drilling #1 made the ball skid through the back curtain.  

Use your best judgement.  Strong assymetrical cores require a bit of thinking and tweaking before you can just put a generic assymetrical layout that the sheet provides.  Typically in stronger assymetricals(mb strengths above .018) I'd go with no stronger than a 5" MB to PAP if you want to promote a sharper change of direction.  Anything stronger will spin up way too quick in the midlane and do nothing down the lane, especially for the high rev players.
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-DJ Marshall
...The Twelve In a Row Pro Shop

You said the strong position appears "weak", well I'd say it's just an optical illusion.  That "strong" position is going to be the position of the MB where the core will spin up to reach it's PSA the fastest.  In this type of core it'll spin up in the strong position to it's PSA anywhere from 5-20 feet out on the lane.  This is in the heads where the ball is going so fast that the user cannot recognize what is happening because we as bowlers are trained to see "hook" down the lane and not early motion in the heads.  You MB on the VAL placement booms on the backend because it starts a stable roll in the heads but spins up later.  So if there's any friction down the lane and no early friction you will see the ball check up quicker in response to friction.

Now your argument about pin buffer distance may hold true with the Saga, but why not with the weaker assymetrical TPC Warrior?  That ball with the same assymetrical layout #1 flared very late and never stabilized a strong enough roll except for instances of extreme friction.
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-DJ Marshall
...The Twelve In a Row Pro Shop