Happend to me also, as I have just purchased my 7411WT. And have been doing alot of research before buying the printer, the selling point was the youtube video with Doug de witt demonstrating the fine detail print being the tokyo subway map… i have set fine detail to be my benchmark before totaly satisfied with product…
However i do have some issues as you can see on the images provided.
Please note the following settings i have used on dark garment with my Forever Lazer light, low temp paper.
For film to imultion paper settings are as follows – 160°c @ 90seconds and works perfect on the fine detail as per video.

For transfer process:
150°c @ 60sec;65sec;70sec;75sec;80sec.
All done with a min of 5min cool down period.

Printer white density is set to -3
MP tray.