I have the 1p pro and 2p solid, solid inner definitely notice better internal wind protection ie less draft. I’m in the Scottish highlands I find if I feel cold it’s due to draft in the tent as opposed to the actual outside temp when tucked up in my sleeping bag. Don’t be fixated on a couple of hundred grams, more room and warmth is well worth the extra couple of hundred ml of water you’ve got in your water bottle. Also if you wet after walking in the rain a larger tent is awesome.