When Baal has used just IPA-99% without MeOH, a longer time waiting on foil amalgamation to kick in was spent. When it was nice and bubbly, the addition was started. Under a Freidrichs condenser, the addition rate was actually same/faster than that with MeOH. Keeping that post-addition reflux at about a medium rate is important in breaking down that foil,(thats what makes the reaction progress)leftover foil usually indicates an incomplete reaction w/ the Al/Hg/Nitro route. In my 'Kickin up the yield" posts, Baal switched to the IPA/MeOH mix in order to give the reaction some new parameters that would help keep the exothermic expansion rate down, while allowing it to progress at the faster reaction rate accompanied with MeOH based reactions. Using flashing would be pointless unless youre reducing large-scale quantities.
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