This definitely counts as chasing decimal points, but you can engineer Lightweight Alloy hull plating (the default stuff that comes on a ship, with no weight). On my Asp Explorer, I get 121 extra hull points from the G5 Heavy Duty Armor modification. Keep in mind this is free. I personally don't have an experimental effect applied on mine, since they all reduce resistance in one or more areas, but it could certainly be worth taking Deep Plating or something.
As far as your actual suit goes, G1 are fine, but you can buy up to G3 pre-built from certain stations. These are all first-come-first-serve, but there is
a thread that keeps track of them, making it pretty easy to pick up G3 gear of your choice.