Ancestor ******/reverence/honoring and necromancy are separate kettles of fish..
If your first approach doesn't bring results, why not try another? There are those times when the Witch is up to bat, and doesn't barrel it outta da' park. So the Witch improvises, grabs a different bat, holds their hands slightly different. I really like your mind set on this, as Witches are skeptical by nature, and just don't swallow everthing they read, or what they are told, but they do keep a critical open mind.
So that worker was not cut out for that particular task or preformed poorly, do you shut down your business because of it... I don't think so, you tweek your advirtisment for hire, to possibly find the right one who would fit in nicely with the job description, you posted. You are going to make your business the most successful it can be, naturally, you didn't set it up to fail.
I have tried different approaches, and I have been most cordial, along with offerings, payment (blood, water, food, alcohol, etc.), but each time, the working goes south ie. the working does not 'work',and I do not feel any warm fuzzy feelings of contact.
When I rely on myself to draw the raw powers, make a sacrifice (my blood), the working is successful.
How many times does one have to go down a street to find a house, but does not find it because it simply is not there. I really have to stop trying this street. M, mentioned the Beloved Dead, but it looks like I do not have any. I invite any spirits/ancestors that are beneficial to me, the success of my working (after all, I do not want a sociopath or an abuser showing up). Prior to that I banish any spirits that would be detrimental. There is protection in place.
I have tried to build that 'relationship' long before doing a working, to demonstrate that I am not just 'using' them.
Well, what can I expect, if the relationship did not exist in a positive way when living, how could it be any different when they are dead!
I guess it is just not my path, as it was not when they lived. I extricated myself from that years ago, although the scars still exist, and act up now and then.
Can I find 'some' good memories - sure, but the bad far outweighs it.
Want the job done right, do it yourself. Relatives - bah, humbug.