There is one popular brand of light transfer inkjet paper that might interest you. On very light fabrics like white, natural and pink this paper leaves no visible polymer window. It is called Jetpro Softstretch. Type the product name in the forum search and you will see a whole bunch of threads on it. Like Mike says, with any transfer paper, temp, pressure and time are all critical elements.
If you have access to Color Laser printing, Duracotton and Image Clip work very well. Image Clip is a truly weedless 2 step process and Duracotton is the laser equivalent to
JPSS (in my opinion anyways)
When I started making heat transfers I tried about 10 different papers and in the end only the three I mention above made the cut for light garments for me.
Good luck!