15A vs. 20A power cord questions


I'm installing dedicated 20A lines with 10AWG cable and Furutech GTX-D 20A wall receptacles. I am currently using the standard IEC power cords that came with my Rogue Cronus Magnum and VPI Scout 1.1. 

I rather not upgrade the power cables at this time. I would like to see the effect the dedicated lines and outlets have first. Are there any issues with running 15A power cords into a 20A outlet and line? Would a 20A power cord possibly sound better or is it just a matter of the blade orientation?
asp307
I did not find the GTX-D Rhodium or Gold outlets to be loose on any blade; I did not find them to have the heavy locking behavior of my old Oyaide R1s either.  The GTX-Ds were easy to work with when it came to stock power cords and the blades could be inserted or removed with nominal effort. They were not loose per se....with my after-market (Elrod) power cords which all use very large Oyaide M1F1 or Furutech FI48 or FI50 ends, the grip was extremely firm but still not locking in nature. Hope this helps...I think you will really come to love these outlets once they get a full dose of burn-in...
@zephyr24069 thanks, I would describe the hold much as you did so I think that's normal. I would assume upgraded power cables may have larger or more robust blades which would enhance grip. I think there have been immediate improvements although since I upgraded to a dedicated line, 10awg wire and the outlets I'm not sure where to give the most credit.
asp307...you are very welcome; hope all is going well and continuing to sound even better for you!!!