I have walked the VDLP in mid-summer but also the Levante and Invierno in Feb/March this year. I used my Marmot Nanowave 55 for both.
My standard "uniform" for February and March with cold frosty mornings and usually getting up to 10-15 C and on occasion as high as 22 deg was:
2 buffs - one to cover hair and ears, the other for neck
Touch sensitive liner gloves which were warm enough and also allowed me to use my phone to check where we were.
Smartwool short sleeved t-shirt.
Paramo Cascada II hiking pants. They are waterproof enough for rain but have excellent venting for when it gets sunny and hot. And you can put them on easily over your boots. But they are not cheap. However I think they are well worth every expensive cent as they last and are very practical. The one day we got drenched, water did run down my back and into the back of my pants but they kept me warm. Otherwise I suspect I would have gotten hypothermia.
Acteryx Squamish jacket as an overshirt over the tshirt. Breathable enough but traps enough air to help keep you warm without overheating once you are in full walking mode.
A down vest if it is really cold but it spent most of its time in a side pocket together with my hiking skirt in case the pants got too hot. The thermal compression leggings I brought were used for post-walking wear as was my hardshell jacket. I do use an Aarn backpack which because it has front pockets almost provides another layer against the conditions
We were lucky in that we got perfect hiking weather for 7 weeks with only one really rotten stormy day that made us appreciate our wet weather and warm gear.
You need to stop for the night in Rionegro on the Sanabres. Best food on the Camino at Me Gusta Comer which is right across the street from the albergue (which is also lovely). Santa Marta de Tera has the Hilton of albergue bathrooms and is well equipped in the kitchen too. It's the village where the oldest statue of Santiago is and if there is any chance of you being around for during the spring equinox, get to the church early to set the sun land on the carving.
http://santiagoinlove.com/en/santiago-sta-marta-tera/ the carving is supposed to be christ. Personally I think it looks a bit more pagan than that.
Zamora is a great city and I recommend the local wine. Toro is
. But I do not recommend sharing 5 bottles of wine between 5 when 2 were tee totallers and someone kept filling my glass. "Tengo una resaca" is not a good phrase to learn the hard way.
Salamanca is my favourite city in Spain to date, equal with Toledo.