"The clear ice (the lethal stuff)"
Another myth - they keep on coming.
There are three forms of ice, rime, clear and mixed.
Clear ice is argueably the most dangerous. It weighs almost as much as the same volume of water, and builds very rapidly. It is also more difficult to remove with boots, but since the average SEP does not have boots this is irrelevant.
However, rime ice and mixed ice will weigh almost as much. Only one inch of ice will add nearly 200 lbs to the weight of a typical single. The aerofoil shape will change in an unpredicable way.
In short any ice is lethal, clear ice may just be lethal more quickly
"The clear ice (the lethal stuff) would need room to runback before forming"
Why?