There has been various work on understanding how shield effectiveness changes with the number of pips to SYS. Frontier have stated that more pips in SYS increases shield effectiveness but have not provided any data on the specifics. However, a recent patch note provided enough data to work this out so without further ado here is the graph of shield effectiveness Vs. number of pips in SYS for both 2.2 and 2.3:
As can be seen, in 2.3 the effect of lesser numbers of pips in SYS will produce a better return in terms of effectiveness.
And for those of you who prefer to think in terms of resistances:

As can be seen, in 2.3 the effect of lesser numbers of pips in SYS will produce a better return in terms of effectiveness.
And for those of you who prefer to think in terms of resistances:
