I have noticed this happening to me in several casual games with different opponents. I have my set ready and put and my opponent shows up and say I want to try a new build. Conveniently it looks as though he sized up my build and built to it's weakness and cheesed up his fleet to get an easy win. It's getting to the point I am almost about to drop playing FFG games because this happens in X-Wing as well. What do I do? The only thing I can think of is hide my build to the last second and give them nothing to size up. But everyone I run into gets nosy and wants to know what i am running I have no problem with that normally but it really seems to be costing me games as I notice quick changes made to either get rid of a weakness and or build up a strength.
The straw was my last set of games when my opponent literally played stuff he normally hates but it was perfect for going against the build I fielded. He even stated post game he just put it together at the last second and then when I confronted him on that wasn't very sporting he doesn't need that advantage. He in a long winded legaleeze way said I sucked and I should of won he was playing a weak build he put together at the last second. I was beginning to rebuild my fleet to a configuration that would of had a chance but he jetted before i could challenge him again. He wins every time we play by a lot. I am not that bad of a player I have beaten people at tourneys he has lost to so what gives? His skill level is way above mine but to have a 1 and 40 record against him makes me think there is something up. Also the 1 win was a very lucky 5-5 1. No matter what I do he wins and this is all I can think of at some point I should of gotten a lucky build and pulled a couple of more close victories by now or at least not be 10-0ed so much.