Hi My Attenuation is low 5-10db.. based on some calculations that puts me 0.5km away from cabinet?

Shouldn't I get 24mb connect speeds? I currently connect at 14.5mb

--------------------------- ATU-R Info (hw: annex A, f/w: annex A) -----------
DSL Modulation : ADSL2+(G.992.5)
State : SHOWTIME
DS Actual Rate : 14616831 bps US Actual Rate : 1240000 bps
DS Attainable Rate : 14380000 bps US Attainable Rate : 310 bps
DS Path Mode : Fast US Path Mode : Fast
DS Interleave Depth : 1 US Interleave Depth : 1
NE Current Attenuation : 10 dB Cur SNR Margin : 12 dB
DS actual PSD : 18. 7 dB US actual PSD : 12. 5 dB
ADSL Firmware Version : 3431301_A
-------------------------------- ATU-C Info ---------------------------------
Far Current Attenuation : 5 dB Far SNR Margin : 12 dB
CO ITU Version[0] : 0000494b CO ITU Version[1] : 00004e53
DSLAM CHIPSET VENDOR : < unknown >