If you don't mind a 1600ly trek, you can pretty much max out your elements in no time.
Simply trade all your grade 4s down for lower grades, and across for Selenium. DO NOT TRADE YOUR SELENIUM.
Until you have no G4's left (except selenium).
Then fly to these planets, and land at a BIOLOGICAL site (not geological);
HIP 36601, Planet C 1 d. (0.08 G) (154,104 ls) for Ruthenium.
HIP 36601, Planet C 1 a. (0.09 G) (154,099 ls) for Polonium.
HIP 36601, Planet C 3 b. (0.04 G) (154,145 ls) for Tellurium.
HIP 36601, Planet C 5 a. (0.03 G) (154,288 ls) for Technetium.
Outotz LS-K d8-3, Planet B 5 c. (0.07 G) (310,420 ls) for Antimony (go to site #1)
Outotz LS-K d8-3, Planet B 5 a. (0.09 G) (310,420 ls) for Yttrium.
.. and shoot the crystals to drop a G4 mat each time.
A couple of hours of shooting, and you'll be maxed out on G4s, and hopefully very full on everything else.
Gravity is very low, so have patience, and your FPS may tank significantly because of the density of the sites.
It's a long old trek, but worth it in my opinion. I'm tempted to trade down even more materials and zip back tomorrow seems the game is effectively broken for combat. Lol
Need a mats hoover for starters.
I don't like having to faff about selecting mats to collect.
If I drive over it with scoop open, should auto pick it up.
Yeah, materials shouldn't need to be targeted (but canisters should).