Kabad in Qur'an 90:4, usually understood to mean "difficulty", is generally taken to refer to the difficulties of physical life that are experienced while living on earth that are the result of the nature of our bodily existence, our need to work and obtain food, and so forth. (Sometimes, it is also understood to refer to difficulties in the afterlife) So it is not referring to Allah experiencing hardship.
Books of tafsir: A good general book is The Study Quran, edited by S. H. Nasr, which contains a summary of views from many exegetes.
Many people benefit from Tasfir al-Mizan; some of it is available in English online and some other parts can be purchased in print.
If you have an interest in Twelver Shi'i narration-based tafsir, Tafsir al-Ayyashi can be purchased in English, and, God willing, al-Asfa fi Tafsir al-Quran by Fayd Kashani will also be printed in English within this year.
If you have a preference for conventional Sunni tafsir, there are many choices in English.
Mixing in minuscule amount is itself a miracle as huge pressure from water from both sides should make full mixing between the two seas, but Allah Created barrier preventing full mixing despite the huge amounts of water from both seas. This a living miracle witnessed and admitted by scientists. Such barrier between millions of tons of waters from two seas can never be created by human beings.
Quran is very clear that Allah Created pairs in every creature but the concept of pairing which we have is not comprehensive for all creature as our knowledge is limited. Allah Knows the pairing in every creature even what we think single like asexual plants, animals, bacteria and viruses. We should never limit the facts of all creatures to our own limited thinking. Allah states in Quran (Allah creates what you do not know) (Sura An-Najm, verse 8).
The Creator Who Knows everything about all His creatures Knows the pairing of what Has Created. Our thinking is limited and superficial while His Knowledge is comprehensive and unlimited.
Allah, The Glorious, Knows who should be included in this verse. We have no right to argue at all. We just submit to the orders of Allah (SWT). The great status of Lady Zainab (AS) is confirmed by authentic statements from the Infallible Imams (AS).
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