Tune Effecting Cruise Control Operation?

[Spoony]

My BFii's got a a tune and minor mods (done years ago). Since being tuned I've noticed that the cruise doesn't work as well as it use to standard.

For example it seems to only apply the slightest of throttle openings (struggles to hold speed up anything but minor hills) and kicks the gear box down gears more than it should. Ie a you'll be in 6th at 105 and it may kick down 2 hills up hill that doesn't need it it yet still struggle to hold speed.

I've noticed usinge ODBII connector to my phone that the throttle position read by this minimum of around 15% even when closed. I don't know if this is some kind of tuning trick but what I think is happening is the 'cruise' things that it has applied more throttle than it actually has (if it's using the reading). Which would explain the odd behavior.

It's more of an annoyance thing but figured someone might have experienced similar or have an idea.