Gotcha. What's the issue with hitting slightly lower and just increasing the temp?
if you've got the ability to manipulate the mash temp with a recirc then there isn't really any danger of hitting a slightly too low strike temp.
My comment was more to remove stress about overshooting.
Basic structure here:
~145-149 - a lighter body, greater attenuation, longer mash time for full conversion
~150-155 - Medium body, medium attenuation, medium mash time for full conversion
~156-162 - Greater body, lower attenuation, shorter mash time for full conversion
however, I generally concern myself with three mash temps
~148 for light bodied, or very high gravity beers
~155 for medium bodied, crisp but malty medium gravity beers
~162 for extra body in low gravity beers or straight up thickness in bigger beers.
and this is all very subtle and variable.