Ocho
Ideally with laying you want to win the same on your longer priced selns as you do on the shorter ones because they are going to lose ( win for you ) more often, statistically speaking. So, in my actual experience, I would always have won more laying a stake not to a liability ( I have done lots of xls studies to prove this ). However, since I like laying longshots I use the liability method because I don't want to wake up in the morning having laid a 330/1 winner. In practical terms the worst loser I have laid in the UK in the last 6 months was about 33/1 so I wouldn't have woken to a nightmare.
With the low price range you mention I reckon you will be slightly better off laying a stake but in that narrow range there should not be much of a difference.