Is a wedge useful for IWB around 3:30-4:00 carry location? Thoughts on trigger guard coverage as well

S&W Shield, Crossbreed minituck holster, I don't love it. Yeah I've got ~15 pounds I could lose and the weight around the midsection doesn't help to push the butt of the gun outwards.​Also, there's a tiny opening where the holster doesn't completely cover the trigger guard opening. While only a grain of rice might fit in that gap, it still worries me it even exists. Should I be worried?​Thoughts on a holster alternative? Not very tall, and not exactly being svelte, appendix carry may not work. Or it may, I guess I would have to try it out. Thanks in advance. via /r/CCW https://ift.tt/2XX8fjH