How you “feel” is only a very limited factor in the performance equation,and by definition a scarce index for any analysis. Athletes may feel like crap at the top level of performance output. We are training for performance,not to feel good.
Feeling good happens by definition between the boundaries of one’s upper and lower comfort zone,where by equal definition there is very limited potential for change,and no growth or evolution.
Over-reaching and over-training are constructs which are used often inappropriately to make up for proper understanding of adaptation processes of humans (and mammalians in general).