I understand this is an old post but I figured I'd put my 2 cents in,
1)the most effective method other than needle (have not tried, nor intend to) is a capsule taken orally, didn't think it would do anything after trying sublingual and insufflated, but lasts longer and more intense in cap and after a 20min wait to come up you feel a 'drop'
2)effective dose in this method is 20-25mg
In one night took a 40mg cap orally, insufflated 10mg, sublingual took 10mg took another 30mg, in total lasted 12hours, felt like I was in a lucid dream world for a couple days. Usually just took a 20-25mg cap and lasts 6hours and is in a range of intensity that I could somewhat function in public, but felt like the town drunk. interesting after effect, I could ride a fixed gear bike up hills that normally would be a strain like they were nothing.