If the spark is weak outside the cylinder chances are there is no spark in the cylinder. Spark should jump at least a 1/2" gap outside the cylinder. When inside the cylnider there is pressure (compression) and oil and fuel (moisture). It is much harder to make a spark in a cylinder than in free air.
Coil connectors (white and black) have a specific position. White is cyl 1 and 2. Black is cyl 3 and 4.
Timing, spark, air, fuel, compression. You played with timing, spark and fuel. Lots to check.