Well... you could try to make some green dragon... so you would know if the problem was with yourself or with the preparation of your butter, as green dragon is an usually more effective way of ingesting THC than edibles...
For making green dragon, i would suggest to you to use anything between 1-1.5x the amount you would smoke usually. Most of times this amount is enough to provide almost the same level of highness you would obtain by smoking it, for a much longer period (hours).
If you make it, remember to drink it with an empty stomach, as drinking/eating weed with a full stomach usually doesnt work.