That's an important point I left out. Thanks for pointing that out. Decreasing an order size while not changing the price will not effect your place in the cue.
If I have a 1000 order and define a max show 100, then what is the priority of the remaining 900 orders? Given the following orders: Trader A E-mini S&P Bids 9330 for 3 lots @14:47 Trader B E-mini S&P Bids 9330 for 1000 lots @15:05 with max show = 100. Trader C E-mini S&P Bids 9330 for 2 lots @15:06 Then, after the first 100 order for trader B is executed, will the next 100 order be placed after trader C? According to the GLOBEX brochure--- "the next 100 lot is entered into the market as a new order"--- I think so.