I was reminded about this video the other day on a FB post that was discussing binding setting charts recommended settings vs what people actually use.
It is quite possible to have your bindings set to a value so high that the heel will release laterally even when it isn't designed or intended to release that way.
Watch as this binding, set at a very high setting in both the toe and heel 'releases' during testing.
The toe does not release. The twisting of the boot within a restricted space created by the toe piece and heel piece results in the heel piece moving backward a sufficient amount that the boot heel slides out of the heel cup of the binding. This is due to the elasticity built into the heel piece to accommodate the flexing and de-flexing of the ski. The adjustment that controls this is referred to as 'forward pressure adjustment' and every binding has it.
Now imagine that this binding was a Pivot instead of an SPX (or variant). The connecting bars and their connecting points would prevent the heel from moving laterally and the toe would be forced to release at its desired torque value.
The moral of the story: if you are experiencing apparent toe releases, turning up the toe's release setting may not resolve the release issue as you may currently or subsequently be releasing laterally at the heel.
Hmmm. People need to know how bindings work before they pick up the screwdriver.
It is quite possible to have your bindings set to a value so high that the heel will release laterally even when it isn't designed or intended to release that way.
Watch as this binding, set at a very high setting in both the toe and heel 'releases' during testing.
The toe does not release. The twisting of the boot within a restricted space created by the toe piece and heel piece results in the heel piece moving backward a sufficient amount that the boot heel slides out of the heel cup of the binding. This is due to the elasticity built into the heel piece to accommodate the flexing and de-flexing of the ski. The adjustment that controls this is referred to as 'forward pressure adjustment' and every binding has it.
Now imagine that this binding was a Pivot instead of an SPX (or variant). The connecting bars and their connecting points would prevent the heel from moving laterally and the toe would be forced to release at its desired torque value.
The moral of the story: if you are experiencing apparent toe releases, turning up the toe's release setting may not resolve the release issue as you may currently or subsequently be releasing laterally at the heel.
Hmmm. People need to know how bindings work before they pick up the screwdriver.
I like to have my fingers around the arm so that when the boot releases I have some modicum of control over it. I also insure that I'm permitting the pivoting handle (in the right hand) to be in its neutral position. 
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