You have the rumors backwards...I don't ever recall folks saying that they are sized 1/2 size too small. It's your feet, just giving you my experience 32 liners packing out a significant amount. Btw the entire liners pack out...just not the toe area. So you also need to account for the heel pocket packing out. Again ime, after 5-6 days of riding the liners will start to feel loosened (the very first few days with or without heat moulding will be painful) and at 12-15 days of riding (without mods) they will be SLOOOOPY. At that time, you will need significant mods to prevent your foot from sliding forward and to get your heel to hold. This is why I recommended the 10's. AND btw even the 10's after packing out will need some mods to get to get a performance fit.
Tips about trying on boots in the store...only use very thin liners or your gf's nylons (not socks)...best would be bare feet. Perhaps bring a small 2x4 piece of wood to put under the toes of the boot when you have them on (and the inner laces and cuff boa cranked down...if you don't crank these down you won't get your heel to set back in the pocket...don't worry about the foot boa, just slightly snug it) and this will give you more of the fit feel for when your knees are bent and riding. Also you might seriously consider to bring your own aftermarket foot beds to put in (take out the shitty stock insoles, they are trash)...at least that is what I do. With trying on in the store, you have to anticipate the packing out of the liner. Rest assured, trying on the boots are going to be tight and perhaps significantly uncomfortable...but you have to anticipate the packout with all intuition liners and with 32's.