I forget if the edge 800 is on the list of "doesn't play nice with stages" PMs, but a buddy of mine has a stages which seems to have serious range issues when talking to his Timex head unit, my garmin 310XT, my suunto USB movestick, or his garmin ANT+ USB stick. Just for a session, try putting your edge 800 on the floor, extremely close to the stages (under the bottom bracket is good) and see if it picks up there.
Edit: He just talked to stages, and apparently "some of the tabs in the case are broken".

Another test that might affect all ANT+ devices: try to minimize your use of other 2.4ghz devices: no nearby microwaves, wifi, bluetooth, etc. Most consumer radio/wireless devices use the 2.4ghz spectrum, and can interfere with each other.

I _think_ the box to check is in the wahoo app on your phone, but I'm not sure. I'd definitely focus on your non-wahoo connection problems before fine-tuning the control settings.

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STAC Zero Trainer - Zero noise, zero tire contact, zero moving parts. Suffer in Silence starting fall 2016