The book contains some methods. I just checked the archive.org version, 20 pages, wasn't there a longer version? Maybe I'm thinking of another book here. I have some of these...somewhere. I haven't bothered looking for them right now, I will do it at some point

I'm still wondering where I put the jaljalutiya... I think the last time I experimented with it was a while ago, too long ago. It's jaljalutiya kubra or something. The spelling, I searched for it online but only found some in Arabic. It could be yalyalutiya, jaljalutiyah a combination of Y's J's.
I am not sure which one to recommend from this book. I keep thinking of some chapter 112 method but was it in there, in this book? I can't check it right now, too busy. I would first experiment with the others. Bahr, kursi dua and 112.
Regarding the dua kursi, bahr and 112. These are very good but you need either formulas or lots of spamming. The question is what are you doing with them in the long run and how efficient will they be? All 3 can be very good. I know it can be very individual with all these practices. They could be great after a certain point or you might have to switch around and prioritize something else. Variety and switching can help. Then again often consistency is the key, daily devotional work. Doing the same thing can become stale and dull.
You mentioned the sihr against you. The sufi kind of advice would be to also read the 5x daily prayers and definitely include ayatul kursi in there, along with 112, 113, 114 and maybe 9/128 and 9/129. The 9/128 and 9/129 are also very good verses. They are used in various rituals. If you have been working with such practices for a while then you probably have some stamina and a connection.
The most concerning part here is how the verse and dua spamming will affect your mind, psyche, spiritual states. Bahr and dua kursi are both considered to be very hot. Intense effects. I can't stress it enough, the line between good and bad effects is very thin and it can go from A to B faster than you can think, especially with hot duas and excessive spamming. You have to evaluate the state at all times. Stuff like this stacks, stacks and stacks again. Sometimes it's good to reset the mind by doing longer cover to cover readings than stacking so much.
You might want to include the dalayl khayrat in there, perhaps. Some people said it is very good in cases like yours. I'm more of a fan of the duas. DK is a bit different. I can clearly remember how somebody in a similar situation said it brought great help. DK can be read as parts or everything at once. Daily readings.
There are many other methods. The chapter 36 ya seen can provide you with relief and you could get connected to the servants. Chapter 20 is quite nice too and so is 73. The chapter 36 method, one of them is to read it 80x, one round of ya seen is 2,5-3 pages.