I looked at your last 6 losses, and you are losing for the usual reasons that have nothing to do with openings. Youre losing because...
Not following Opening Principles.
Missing simple tactics.
Hanging material.
Opening Principles:
1. Control the center squares – d4-e4-d5-e5
2. Develop your minor pieces toward the center – piece activity is the key
3. Castle
4. Connect your rooks
Tactics...tactics...tactics...
Pre Move Checklist:
1. Make sure all your pieces are safe.
2. Look for forcing move: Checks, captures, threats. You want to look at ALL forcing moves (even the bad ones) this will force you look at, and see the entire board.
3. If there are no forcing moves, you then want to remove any of your opponent’s pieces from your side of the board.
4. If your opponent doesn’t have any of his pieces on your side of the board, then you want to improve the position of your least active piece.
5. After each move by your opponent, ask yourself: "What is my opponent trying to do?"
Is there really a need for anyone below 1800 to actually study openings and build an opening repertoire ?
At the moment it seems to me that all someone needs is good strategic and tactical analysis and openings seem to tunnel chess vision and fantasy.
The question is beyond my skill level which is really low but extends to the actual study one should follow up to 1800-1900.