You now have a perfect shooting head, which will never overstrain the rod, and with which considerable distance is possible. The technique for achieving this distance is known as the double haul. Once you have found the perfect length and weight of line for your rod, you can in future then match any line to this rod quite easily. Just weigh the length of line you are now using on an accurate balance or weighing machine. Any line of this weight will also cast perfectly with this rod, irrespective of length.
Some people prefer short heads, and others slightly longer ones.
The only disadvantages with a head, are that you can not roll cast as soon as the head is outside the tip ring, and you must retrieve backing until the casting line is inside the tip ring before casting again. For absolutely maximum distance, a short length of lead core line matched to the rod is the best instrument, this requires impeccable timing if you do not wish to take one of your ears off, and is useless for most normal fishing purposes. The haul is basically a pull on the line by the reel hand, at the start of the backcast, and then again at the start of the forward cast, which gives much increased line speed, loads the rod better, and increases distance without strain. The backing is laid out before the cast, preferably in a line tray or similar so that it can not tangle, and is shot at the end of the forward cast. The double haul technique is also extremely useful in high winds, or when casting heavy flies even at short range.