A 1G barrel roll would be impossible...at best you could expect 1G at the inverted stage and 2G at the completion of the roll but still nose down but recovering. The way I was taught was to turn off to say the right with turn overbanked to get the nose down. Then start the roll to the left but maintaining positive G by keeping back pressure on the stick. For the first half of the roll the nose would be above the horizon and for the second half it would be below the horizon. To avoid a steep nose down attitude at the end of the roll, you need to ensure that the nose comes high enough above the horizon in the first part of the roll. Mistakes are usually to not get the nose high enough before the roll passes the 90 degree of bank station. This will result in a steep nose down attitude as you come out of the roll with large loss of height...So next time get the nose higher
The slower you roll, the more difficult the manoeuvre, so leading a barrel roll as a formation aerobatics team leader is pretty hard to do well...If you roll too fast you will start shedding wingmen
