Sorry for what happened and welcome to the sport.
50lb is quite tough but not ideal for winds over 8ish. Now depend on the length too.
Your SF Pro UL will fly fine up to the 8mph and i will not take it out over this. On 75-85' 90lb it will be very nice flying this setup.
Now on lower winds let's say 2-5mph, i will switch to 50lb but shorter. 0-3mph i will use same line but on 50' but this is lots of walks and work out but is fun too on shorter lines.
For any kite UL or STD, in winds over the 8-10mph i will use 110-150lbs lines on 75-85'. This is a common strength and length for these kite in those winds.
So resuming all this, what you would need now is a set of #50-50', #90-75' and #150-85'
Now you cover all the wind range and quite ideal for your kites...
For me above the 10mph i pack up my Lovely duals and step into the Dark Side with my Rev
Hope this help you and have great fun