I take it that it was made from new [unused] wood, if so then you'll be very dissappointed with the results even after 3 years. The whisky will have changed markedly from what you used picking up some of the [for scotch anyway] nastier flavours. That's the reason virtually no scotch whisky is aged in new casks. The time I asked about this the comment was that you had to fill it with new grain whisky every 6 to 12 months [for a 220L barrel] at least 3 times. The grain whisky then had to be filled into good barrels to finish their aging or it couldn't be used.
Far better filling it with sherry for some years to take away this initial flavour.