You should follow the recipe. Perle Hops generally have a much higher alpha acid content than Saaz. The Saaz Hops are there for aroma and flavor, while the Perle are pretty much just bittering Hops.
One of my fellow employees is also a Homebrewer, but he kegs. So I could try his beer, he put it in a Growler from a local Brewery (Buckbean ftw!). Anyway, I had it in my fridge for a couple of days, and it had already lost some of it's carbonation. My guess is that you will lose most if not all...
The two main issues with boil volumes are Hops utilization and caramalization of the Wort. Your best bet is to follow the instructions, as the amount of Hops should be based on the boil volume indicated. To cool your Wort more quickly, pick up a Wort Chiller.