Thank yoou Andy
and this adds a day to the primitivo? so from lugo to santiago via norte is one day longer than via the french?
Not really. From Lugo, it’s 4-5 stages either way, depending on how long you want to make your stages. When we went along the Primitivo directly to the Frances, our stages were Ferreira, Melide (link-up with the Frances), then Salceda, LavacolIa, Santiago. This could have been shortened one day readily enough but we were in no hurry. if you go via the Camino Verde and then follow the alternative past Boimorto, the logical stages are Friol, Sobrado, Boimorto, A Rua or O Pedrouzo, then Santiago. With the exception of the Sobrado - Boimorto stage of only 11 k, these stages are all in the 20 - 25 k. range, and are pretty flat. The Sobrado - Boimorto stage is necessarily short because there’s no place to stay between Boimorto and the junction with the Frances (wherever you hit it). If you want to cut your stages down to 4, the logical thing is probably to extend the Lugo - Friol stage a further 8 k. There is a place to stay at Reguela called Hotel Rural Biterra. From there, you could easily make it to Boimorto in one day. Alternatively, you could push the Friol to Sobrado stage to Boimil, which is 2 k short of Boimorto and has an albergue.
Note that I don’t have any personal experience with the Camino Verde — the stretch from Lugo to Sobrado — but there’s very detailed information, including gpx tracks in the link I sent you. Had I known about it at the time we did the Primitivo, I definitely would have followed it rather than heading to Melide on the Frances.