I think you have to take it slowly but Wizz favoured teaching Sasa via her food, we got some way in but I couldnt deal with Misa being hungry all the time and them not being able to have food left down.
Here is what she suggested:
Put their food down at set times only and dont leave food out for them.
When you put their food down you stand, sit, kneel about 6 foot away from it and stay there until they have eaten.
Once they are happy eating that distance from you, bring the dishes a foot closer.
Slowly as they get happy eating a certain distance from you, gradually make the distance between you and dishes closer until they are eating next to you........................do not attempt to touch them unless they come to you and ask for attention.
If they eat treats or biscuits.....something special and different from normal food, put some in another room on one side of room and sit on the other while they eat them.
Once they will have them in your prescence, move them a bit closer to you.
As they get happy eating at each position, move them until they are right close to you................you should have started siiting on floor ages ago LOL
Once they will eat next to you put the treats in your hand................and thats wher I got to cos sasa will eat out of my hand. By now she should have been coming for attention and strokes but I had to stop it, I tried stroking her the othervnight but she cringed backwards and hates it.
Sasa came to me at 8yrs old and is now 10, so this should be much easier with younger cats and you must not try to touch them throughout unless they come to you and say rub or headbut you.......its all a matter of trust and patience and TLC.
I hope you have quick success and this is to enable them to associate you would something they like, without any threat and to hopefully they will come to you and want to be stroked.
Also playing with fishing rod toys like da bird may help as long as you do not move it tto fast or suddenly. Because you are playing at a distance they dont feel threatened.
Sasa will also play as long as she is about 18inches to 2ft away from me. She also loves the laser chasing toy...........you must not shine it in their eyes............and limit all toys and games to about 5- 10 mins. Sasa also likes feathers and real catnip mice.
Hope this might help a bit.