I just strung up my flex solo set for the first time in awhile and the 4th string seems excessivley floppy and loose. The sound on the upper three strings is sonorous and nice but the 4th string is playing like its de-tuned a whole step for more. Has anyone else noticed this? Could I have installed it wrong? The string is wound around the shank more than three times and doesn't cross itself or touch the side of the box. Is it just me? am I losing my mind? I should get a spirocore.