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As a side note to anyone experimenting with the i2c baudrate, you don't have to set the baudrate via config.txt, which requires a reboot. You can do it at runtime by configuring the kernel module with modprobe:
sudo rmmod i2c_bcm2708
sudo modprobe i2c_bcm2708 baudrate=400000
Also bear in mind that Pi does not support clock stretching on I2C, so I2C devices ...
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Most of what you have configured is not needed and may be part of the problem.
Don't add modules to /etc/modules, don't set the GPIO mode with raspi-gpio or similar, don't enable automatic load of I2C kernel at boot.
Remove everything you have done and just add the following line to /boot/config.txt.
dtparam=i2c_arm=on
Reboot and check that the device /dev/...
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Yes, set the GPIO back into mode ALT0 (needed by GPIO 2/3 to be in I2C mode).
Tiny GPIO has the following define to use to set that mode.
#define PI_ALT0 4
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