When I'm happy where I'm at, I bid my current position at a seniority level that is comfortable. For example when I was ATL 7ERB at 65%, I wished to remain in that category as low as 75%. I would bid ATL 7ERB 75%. My next lines were the escape hatch if I got dog piled by senior bidders, such as NYC 7ERB 50%, DTW 7ERB 65%, etc. As long as I remained 75% or better I would remain in my current category, but there was a backup if I fell below my threshold for that category. Movement to other categories is subject to vacancies, so if you employ a strategy with a backup plan for deteriorating seniority have a few options.