You can probabley figure it out. Get Juice to say 1.09 or1.085. I'd add some strawberry personally, Add some yeast nutrient. PH on Rhubarb should be low enough no problem. Add some pectic enzymes. I would go with Levon 1118 yeast. . Put pe in then let sit 24 hours before pitching yeast. As far as adding strawberries goes I this you could try adding strawberry Jam for flavor. Luc makes his strawberry wine out of Jam. If all else fails I can drive down Hyway 9 and take the juice off your hands. Really, I dont know who new to wine making you are. Need a hand ,let me know