Test strips are unreliable and limited. Liquid test kits are more reliable than test strips are.
Without buffering substrate, you need KH to help keep the pH stable, so that I wouldn't change, but you do need something to raise the GH.
If you want to have the best chance of success, you need to start over, from scratch. You need a buffering substrate, RO/DI water and GH+ only shrimp minerals.
That is, unless you can find someone who keeps bee shrimp in water with 2-3 KH.
We can't tell you why your KH is higher than your GH unless we had more info... i.e. your GH and KH out of tap, what's in the tank, etc.