All advice is right on the money - you need a purpose-made belt that will pull that grip into your body, and a good IWB. Once you have those you're good to go - together with a few little behaviour mods, like crouching instead of bending, reaching for items with the hand the same side as your firearm is holstered (shirt will lift up a little - but away from firearm - not pulled tight across it), lightly pulling the hem of your shirt as you begin to rise from a chair so it slips over the grip rather than getting hung up, etc etc.
Most purpose-made belts and good IWBs will work - I am personally very happy with beltman ($90) and concealco ($60-$80), after trying various others over the years. A shiny side-out leather IWB worn next to the skin will develop a bit of 'stiction' and will make the holster extremely steady.
Then don't worry about it. Seriously. Most people probably wouldn't notice it if it were balanced on your head
