If you want a better quality beer, for the love of god, wait another week! A gallon of starter wort is to much imo to pitch in a batch. I'm not even sure a gallon will ferment properly in that short of time. To make a great lager, you need a huge starter. I would shake the piss out of it, you need oxygen.
Let it ferment out 3-4 days, then refrigerate at least 3 more. Lager yeast will not drop out as fast as ale yeast. On brew day, cool wort as low as possible(low50's), take starter out of fridge, decant and cold pitch. I guarantee these results.