Usually after generic (or branded) HCV treatment, the trend in ALT/AST levels is almost always downward, but some fluctuation is normal (I can report the same thing myself).
As for consumption of cannabinoids, my first advice would be don't worry about it unless you are having adverse side effects.
After HCV, the next biggest daily threat to the liver is alcohol. But moderate consumption is probably perfectly OK (I have personally reported quite a bit on this here - bottom line for me: absolutely no problem).
The only way be sure about what is happening with the virus (if any), is to get another PCR RNA test to confirm its still undetected.
The odds are highly in your favour on still being UND.
If you are UND but your liver enzyme levels are fluctuating enormously, then it would be worth getting a proper medical opinion. Otherwise, don't sweat it. Since you are "only" at about 8 weeks of TX, it will take several months for your virus-free liver to really re-build and settle down to more normal enzyme levels.
Diagnosed Jan 2015: GT3, A0+F0/F1. Fatigue + Brain-Fog.
Started Sof+Dac from fixHepC 10-Nov-2015. NO sides.
Pre-Tx: AST 82, ALT 133, Viral Load 1 900 000.
Week4: AST 47, ALT 58. VL < 15 (unquantifiable).
Week12 (EOT): AST 30, ALT 26, VL UND
Week16 (EOT+4): AST 32, ALT 28, GGT 24, VL UND
Week28 (EOT+16): AST 26, ALT 22, GGT 24, VL UND
Ever grateful to Dr James.
Relapsed somewhere after all that... Bummer!
Jan 2018: VL 63 000 (still GT3).