I use Pentax k100d modified to IR (perhaps 720nm, can't really sure since i bought it 2nd hand)
I shoot in RAW format, so WB won't be any issue, you can always correct it later
Step 1
Converting RAW to JPEG
Step 2
Select Auto Level
Step 3
Adjust channel Mixer things (swap blue/red channel)
Step 4
Adjust curve to slim S shape to darken the sky and brighten the leaves (adding contrast), and this could bring some noises out or strange color cast, it's up to you how to adjust
Step 5
Select Auto Color and do Color Balance thing (I prefer yellowish, so i move it towards yellow, abit magenta, till i love the result)
Thank for the detail explanation. Below is my thread. Out from the camera my photo - leave is not white and my colour don't look good as compare to your origin photo above.