My idea is your stack sould be as far as possible from data. Normally it's should be at the last of your internal memory.
such as(I use Keil)

Iseg at 0A0H (in case of internal ram 256 bytes)
?stack ds (0FFH-0AH)

My idea (again) ,for your data it should be start after bit addressable which will be much more memory utilized by software(you can use more bit rather than normal data).

For your message that "collision with relocation" ,it's not so ture .if you 're carefully treat them.