I'd suggest using Coriolis to create a build with the smallest possible D-rated shield, modded for ELP and then fitting 0E shield-boosters, modded for kinetic resistance, into any spare utility slots.
If that's not enough, fit a bigger shield until you're happy with the result.
SBs are a good way to enhance an exploration ship's shield, which shouldn't be overlooked.
My exploration Phantom, for example, has a jump-range of 67.2Ly with a 4D shield and 206mj of shield (343mj kinetic resistance).
If I add 3x 0E SBs, it adds 1.5t to the weight, reduced the jump-range to 67.07Ly and gives me 262mj of shield but a whopping 786mj of kinetic resistance.
By comparison, upgrading the 4D shield to a 5D shield (alone) adds 2t to the weight, gives me 268mj of shield but only increases the kinetic resistance to 447mj.
So, 3D shield + 3x 0E SBs is lighter and twice as tough (kinetically) as a 5D shield.
I don't see any point in fitting a combat-capable shield to an exploration ship because, unless you've also got suitable weapons and thrusters fitted, you're not going to be doing any combat.