A little analysis to illustrate your situation, if I may:
from a 1999 Stereophile review I noted that the B-weighted efficiency of your Maggie 1.6QR is 83.7dB-per-2.83V-per meter. This is into an 8 ohm load. From the same review, it looks like the 1.6QR is essentially a 4 Ohm speaker.
I calculated the 4-Ohm efficiency to be 82.2dB/2V/m. That's a pretty low efficiency. It means that for 1W (using a 4 Ohm load) fed into the speaker, you'll only get 82.2dB SPL at 1m/3.3ft.
If you are sitting at 10ft away from the speaker, the SPL will reduce 6dB at 6.6ft & 9dB at 9.9ft.
So, at your listening position, the expected SPL will be 82.2dB/2V/m - 9dB + 3dB (for stereo sound which uses 2 speakers) = 76.2dB for 1W/4Ohms fed into the speaker. That's a pretty low volume, if I may say so.
My calculations show that if you want, say, 106dB SPL peaks with your 1.6QR, you will need a 1000W/ch into 8 Ohm amplifier! And, 106dB SPL peaks are OK high - for some genres of music, peaks can get to 115-120dB which will need even more power...
So, the answer to your question
I know they are more powerful but would my Maggie 1.6qrs benefit from more power than I have or would it be a waste of time/money.
is a yes!
I've known Maggie owners to use high-wattage, high-current amps on this brand of speaker due to the rather low efficiency.
The ARC D130 amp will give you some sound thru your 1.6QR but you are probably not hearing what these speakers are capable of. In your particular case, no amount of amplifier power is enough.
The SQ is something you'll have to determine for yourself since you'll have to live with your amp choice.