Line Stats Comparison ASUS DSL-AC68U vs HG612

[#1]

Well I've been with PN now for nearly a month and am overall very happy so far. I still however have a little hope that I may somehow be able to get a bit more speed 
Below are two snipets of stats. First from my ASUS-DSL-AC68U working as an all in one solution and the second from an unlocked HG612 using the ASUS as a router only;
ASUS;
SNRMarginDown=6.1 dB
AttenDown=10.4 dB
SNRMarginUp=6.1 dB
AttenUp=0.1 dB
DataRateDown=60392 kbps
PathModeDown=FastPath
DataRateUp=16456 kbps
PathModeUp=FastPath
FECDown=716
FECUp=72
CRCDown=84
CRCUp=15
HECDown=0
HECUp=0
ADSLUpTime= 3:39, 53 secs
AttainUp=16527
AttainDown=75088
HG612;
Max:  Upstream rate = 17046 Kbps, Downstream rate = 57924 Kbps
Bearer:  0, Upstream rate = 16983 Kbps, Downstream rate = 58396 Kbps
      Down      Up
SNR (dB):    6.1      6.0
Attn(dB):    17.3      0.0
Pwr(dBm):    13.2      6.9
Total time = 1 days 12 hours 21 min 19 sec
FEC:      0      1787
CRC:      1549      290
ES:      1217      279
SES:      0      0
UAS:      42      42
LOS:      0      0
LOF:      0      0
LOM:      0      0
Now the bit that gives me hope is the AttainDown=75088 on the ASUS. Why would this be so different to the 57924 figure on the HG612? I realise the actuals are similar(ish) 60392 vs 57924 but if the ASUS is to be believed surely I can get a bit more out of it.
Just for info I'm on an ECI cab and have just installed a MK3 faceplate to replace the old MK1.
I appreciate your thoughts?
TIA, Mick