Yes, you may not need voxilaprevir. Sofosbuvir (an ns5b inhibitor) creates temporary resistance s282t that gets cleared by itself in 6-12 months.
onlinelibrary.wiley.com/doi/10.1111/jvh.12405/summary There are also L159F and V321A, but those were found to be weak and to not influence treatment outcomes greatly.
jid.oxfordjournals.org/content/early/2015/11/24/infdis.jiv564
In contrast, Ns5a inhibitors create permanent resistance.
Yes, you should wait for lab tests for resistance to see if you have any baseline RAVs, except possible ribavirin resistance.
www.ncbi.nlm.nih.gov/pmc/articles/PMC3961994/
www.ncbi.nlm.nih.gov/pmc/articles/PMC4786064/
www.nejm.org/doi/full/10.1056/NEJMoa1512612#t=article
Resistance profile of velpatasvir looks slightly better then the one of daclatasvir for gen 2 viruses. (According to the articles above).
The choice between vel and dac, of treatment duration and whether to include ribavirin for the third time is a really important one and depends on your fibrosis state and baseline RAVs. The addition of vox vs using ribavirin for the third time, if needed, also depends. You should research it very carefully. Vox may be not necessary and would possibly bring in NS3 resistance, if failed.
The outlook for you is very good though, if treated properly (and timely).
Gen 1b
VL pre treatment 29000 ME/ml
AST 32 ALT 94, F0
Started treatment 13 January 2017
Generic sofosbuvir/velpatasvir (Incepta)
VL 9 days into treatment <300 (undetected)
AST 13.8 ALT 22
Side effects: mild dehydration, not a problem at all if I drink water at night, nothing to worry about
Diet and gastric ph are very important with velpatasvir. One must think what and when to eat to keep gastric pH low. Side effects disappeared 2 weeks after, unless I ate anything < 4hrs before the pill. SVR60.