If you can get it closer with the fan why not? I think the stretch may be because of the 12/12 mine did the same but all plants during 12/12 do it so makes sense right? Start a grow journal bro I'll be sure to check it out
If you're gonna listen to anyone listen to dr who, add cal mag and slow down a bit on the nutes.. No point trading over feeding with under feeding right? Just feed once a week or every third watering...