Just checked, i have -rt when mining to D7 pool. For me it works nicely, D7 shows the hash rate at 150-160 Gh/s (5 hboards, Bitfury management shows about 160-167).

I have stratum proxy set up to restart in 15 minute intervals, not sure if that has anything to do with this... no automatic restart for chainminer, even though i think it would be good to set that up too.

speed:4276 noncerate[GH/s]:162.393 (2.030/chip) hashrate[GH/s]:184.398 good:11343 errors:1148 spi-errors:0 miso-errors:0 jobs:291 (record[GH/s]:167.933)
0:   811   32.312   34.626   2257   109   0   0
4:   821   30.838   36.064   2154   321   0   0
5:   888   33.186   39.911   2318   414   0   0
8:   883   34.861   39.604   2435   208   0   0
C:   873   31.196   34.193   2179   96   0   0

Hmm, seems it might be good idea to do some finetuning again, more errors than last check a week back.