Just stay on top of that SLAM and in no time you'll be there, also be sure to maintain the once or twice daily brushing and/or vacuuming. I recently completed a SLAM as well and my results couldn't have been more pleasing. As many around here will tell you, don't stop until that water is 'gin clear'. The closer you get to the goal the less FC loss you'll see each day. Always round up to the next highest level for the CYA/Chlorine chart, so go with 50 if you believe your test was relatively close and SLAM to 20.
if you can, post daily pics in the thread from the top of the steps looking down. It helps everyone see the progress that is occurring. Nice work, keep it up!