Fellow users of Claymore, I need some help

I have 1 miner with 6x AMD RX580 mining on Linux Mint 18.3, Kernel 4.13.0-41, amdgpu-pro driver 17.50, Claymore 11.9

The miner is running stable 175Mhs but still need some fine tuning.

I have modified the BIOS of the RX580 to achieve near 30MHs just by copying the bootstraps. Did not change values on the voltage.

Since I am achieving 175MHs means I am close to the 180MHs that is the standard for these RX580. So the MHs is not the issue.

The issue (where I need help) is related with Claymore software:

    1 - No matter what changes I do in Claymore parameters -cclock and -mclock it has no effect whatsoever on the mining hash that is constant at 175MHs. This is what I do not understand. It seems the miner Claymore has no control over the GPU's clocks (core and memory)

    2 - When running same miner on Windows 10 Pro I can adjust power usage (undervolting) to reach less power consumption by using OverdriveNTool and adjust voltages for 800 and 875 thus running the miner at lower temperatures and lower power consumption. I was expecting reach the same good results by adjusting the Claymore parameters to -cdvvc=800 and -mdvvc=875 but it does not work. It seems the miner Claymore has no control over the GPUs voltage (core and memory)

Here is my start.sh:

#!/bin/bash
export GPU_MAX_ALLOC_PERCENT=100
./ethdcrminer64 -epool ssl://eu1.ethermine.org:5555 -ewal xxx -epsw x -eworker xxx -etha 2 -asm 1 -mode 1 -wd 1 -tt 65 -cclock 1150 -mclock 2030 -cvddc 800 -mvddc 875 -platform 1 -y 1

Unless I am forgetting to do some adjustment I am reaching the conclusion the Claymore software is useless to adjust clock and voltage on Linux. It seems that the parameters -cclock -mclock -cdvvc -mdvvc are useless on Linux. Can this conclusion be correct?