We have been trying different ways for logo placement through the rasta colorway and the LPH. Under the kangaroo pouch is a signature location for our HPH hoodies but the exact size and justification are topics of discussion.
Maybe place the logo more to the neck/shoulder.. If your garments get to be worn in competitions, the startnumber might block your logo, and mugshots of winners will not always cover the entire body. If your the logo is near the head most people will notice, also when standing in line for crowded lifts, nobody can see a logo on ones belly when it's crowded.. Still my honest opinion, merchandise wear like t-shirts, caps, LPH should be used for branding & logo placement, high quality wear should all be about the quality, if this stands out people are going to want to find out what brand it is.. And use one & the same place for small logo/outside label placement on all garments. For some brands you know you can check any garment for a "green label placed on right shoulder and know it's brand X, if it's not there its another brand" this really aids visual recognition of all your clothing and lines to come, because it creates a solid visual identity..
No thanks for the input really like to see cool new companies grow in an sustainable way, if you got any other questions or need input feel free..