Are you using a regular stingray clone, or a stingray x?
If it's the Stingray X, are you using the standard 510 top cap, or the hybrid adapter?
Is the switch on your stingray binding at all? Or does it have nice smooth travel?
Would it be possible for you to post a pic of the 510 connector on your IGO-W? For Stingray devices using the hybrid adapter, the 510 positive connection needs to extend beyond the threads.
Are your posts nice and tight on the IGO-W? Maybe you have an open connection somewhere?
Sorry for all the stupid questions

Just trying to get a feel for what we're dealing with here and we can advise you better from there.
Welcome to ECF! Hope we can find out a solution for you!