I don't see a Quincunx (inconjunction). There is no quincunx in your chart.
Changing time of birth in the range of 4-5 pm (one hour) will not significantly change aspects between planets. It will, however, create or extinguish a quincunx between a planet and an Angle.
Birth time is not so critical for purposes of aspects from planet-to-planet.
In your particular chart, even a change of +/- 1/2 hour will leave the MC and quite probably the Asc in the same signs they occupy in this chart-as-published. If I were reasonably certain that a time of 4-5pm embraced actual time of birth, I would do just what you have done and set the chart for 4:30.
The quincunx is an "unfavorable" aspect. Here is what I say about it in my thread "General Effects of the Aspects":
"Quincunx, (Inconjunct) The quincunx (KWIN-cunks) aspect results from the division of the circle by 12, and is irregular, being an angle of 150°, and in medieval terms the two planets involved “do not behold each other.” It is an aspect of disharmony and disjunction. The two planets are in some way inharmonious, out of balance, or out of touch with each other. It creates conditions of uneasiness, irritation, and maladjustment. It operates subliminally, just on the edge of consciousness, and calls for regeneration or reorganization. The aspect tends to operate in a continuous manner. Recognition is lacking. Situations described by the quincunx lack clarity or focus, and are often surrounded by silence, indifference, or disorganization. The things or persons indicated by the planets involved are averse to each other, alienated, out of contact, and not on familiar terms, and yet tend to generate friction, discord, disharmony or upset. This aspect is often involved in questions of ill health and death. Here, the right hand knoweth not what the left doeth. I have an incest chart in my files in which Venus is Ascendant Ruler, posited directly at the Descendant in Scorpio, and tightly quincunx Moon in the 12th; the mother was aware of the abuse to her daughter by the father, but never said a word. She “did not behold” the sexual molestation of her daughter, and “turned a blind eye.” The quincunx produces strain, grating, discomfort, frustration and abrasion. It can indicate “being out of joint,” just not fitting together. Some astrologers suggest this aspect can produce unrealistic expectations or aspirations, while others claim that it is expansive; the first I agree with, the second I question. Judge by your own experience."
You can access any thread (or post) that anyone has made by clicking on their name (in the header above this post), which will take you to their profile. Once in the profile, look in the right-hand column, near top, and you will see "show all statistics; click on that. Then, in the left-hand box you will see "Find all threads started by greybeard". Click on that, and all threads started by that person will be listed and accessible. In the thread "General Effects of the Aspects" you will find the most important aspects listed and described. If you wish you can copy the thread as a whole and store it somewhere on your computer for easy access in the future, when needed.
I disagree with Zarathu here. The quincunx, like all other aspects (and including the yod formation), is effective from birth and continues its effects throughout life. I would also point out that what mdinaz says is true ... "I find an inconjunct (quincunx) to be a spiritual aspect that is initially difficult but if mastered, can be applied to your entire life as a whole and allow for great gains in spiritual growth.", it is not everyone who "masters" the aspect. Even when "mastered" (i.e., you have come to terms with it and, through age and experience "grown spiritually"), it can still produce unpleasant states and events. What happens is that the difficult effects of the aspect give us experience in dealing with them, and if we learn to do this, spiritual growth accompanies the process.