I am also reading 5LL and it supports what I thought that my w seems to have increased her acts of service towards me. If that is her ll does that mean she will be most receptive to acts of service than the other 4ll?
Depends. if the effort is genuine and something that she wants / needs done & she is not pi$$ed at you, then yes...she will be more receptive to it than the others.
now with that said, a nice thoughtful gift out of the blue (WITH NO STRINGS ATTACHED) can be very appreciated. my wife loves flowers. picking up a nice batch of odd colored roses when you stop to pick up a gallon of milk is very nice idea. Be careful though, gifts can be construed as 'buying forgiveness' so No Strings and No Pissed are absolutes.
I know I mentioned this one pretty early on here at DB, I ordered my wife a daily / weekly planner from national geographic out of the blue. her grandma used to order a stack of them for the aunts and uncles and older grandchildren every year. she had passed away and the calendar's didn't come last 2 XMAS's. When wife got it in early January, she beamed for a week and we now look at the weekly picture every Monday together.
Now depending on your wife's LL depends on the results of your actions. if it is words...you can be really creative there with a note hidden with her morning coffee.
I think the key here is heartfelt, gifts/acts/words of love. finish the book. maybe she would be willing to read it with you and do the quizzes. we had fun with it (it was going on 4 years ago, but I digress).
if the effort is genuine and something that she wants / needs done & she is not pi$$ed at you, then yes...she will be more receptive to it than the others. 
