Poolish bread spreading out rather than rising upwards

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I have tried sourdoughs, plain white breads, and poolish. My ultimate goal is a crunchy crust and soft, holey crumb. Poolish recipes have gotten me the best results for the least complexity, but the loaves won't rise "upwards". I spray the hot oven with water to get the crust crunchy; I let the preferment sit for 12 hours; I allow long slow rises with folding in between. I let the dough "rest" after the first mixing, and before shaping. The dough rises nicely, but becomes slack after I shape it. After the shaping, it never retains the nice oval or ball-like form I've given it. What's up?

http://imgur.com/a/7Bnxq

Poolish preferment fermentation is roughly approximated. Some flours ferment faster than others.   Try only 8 hrs. for the poolish preferment or reduce the pinch size amount to much less for a 12 hr ferment.  Temperature plays a big role. 

Mini

Are you placing it in a basket or bowl for final fermentation to give a little vertical bracing?