Honestly, if I were you, I'd forget your home scale. Go by what the meeting scale says every time. It is the only scale that matters when it comes to being a lifetime member & keeping track of two weights just sounds like HELL to me!
I have a home scale too & I try to keep in mind that my weight fluctuates at certain times of the day, every day. Especially when I'm on my period & I'm retaining water-I've seen a 5 lbs. difference on my home scale in just 1 day!