Luckily I'm currently in my Clipper, so I can take a closer look...
In fact I have only 3 shield boosters equipped, 2 of which are heavy duty with 73.x% and 1 is thermal resistant. That C7 SCB really requires a heat sink launcher
Oh, and I've got 3 guardian shield boosters in my optionals... those are ideal for ships with weak base shield strength.
Resistances are as follows:
View attachment 203945
Not perfect, but wouldn't call it terrible either.