TM5 is not forward sounding, if you mean the illusion of closer placement to the stage, like Grado reproduces. If you like this type of sound, most likely PK1 is your cup of tea.
Recently I tried
MX75 foams and this made the sound darker and more relaxed. Now iPod 5.5 gen headphone out > TM5 combo sound pretty similar to WooAudio 3 > HD650. HD650 has tad warmer, richer and forward vocals, while TM5 soundstage is more open and breathing. So you may consider TM5 sound sig to be quite similar to HD600/HD650.