it was a good idea, though. actaully eric suggested the exact same formula.
just want to add some good news: i pre-bolused 40 minutes this morning before bfast. i waited till i was trending down, and i did NOT spike (only went up from 109 to 128 )and 4 hours post bolus i was 103. perfection.
i think i might have found my formula 
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That is good news DM. Long may it hold your bg in check.