Help with mutation, and other questions

Hi guys, I'm new here, but not new too parrots. I just adopted a 6 month old Fischer's Love Bird. He was 4 months when I got him, and seems to be doing well. He's still a little shy, he knows the step up command and just loves to hang out on shoulder, and chew on a rag I keep over my shirt, as he is a BIG TIME SHREDDER. I haven't raised Love's in 30 years, so I'm little rusty on remembering.

Marty is a little nippy, but I try not to pay attention to it, as that's what I was told to do. He'll stop, if it gets him no attention from it.

I have 3 questions, and I want to thank everyone in advance for your help.

1. What mutation is this bird? I am going to try to upload a picture, I seem to have trouble with that.

2. Being a little shy, I try to keep him out on my shoulder, his favorite spot. He lets me know when he wants to go home and eat. I can stroke him down his back, and in front down his belly, but he doesn't like his head rubbed, he will tolerate a stroke or two but that's it. Is this normal?

3. Being home all the time, I have plenty of time to spend with him, and I wanted to know what kind of interaction I can do, or use to make him just a little bit more snugly. I know every bird like humans have their own personality. I was just wondering on some kind of time frame to look at. I can hold food with my fingers, or lay it on my shoulder and he will eat. But he wont eat out of the palm of my hand. Whats the best way to accomplish this?

Again thank you for all your help and advice, we have several parrots, I just thought I would get the ball rolling with Marty the Love Bird.

1. Sorry, I have no idea.

2. Yes!, it is normal... he may not like head and cheek scratches, every bird is different.

3. You can play small games with him (like you can cover your face with your hands, remove your hand and say peekaboo!, hide n seek etc). You can also teach him tricks like fetching, recalling, going through a slinky, birdie basketball etc.
Remember each bird has it's own personality, so it's ok if your bird doesn't want to be snuggly. I'd say though, bond with him and whenever you pet his back or something give him a treat, also put videos of other bird of them being snuggly.
Lay two of your fingers horizontally and put food on it, then slowly start to unfold all of your fingers and then move the food backwards near your palm and within days (or weeks) your bird would be eating out of your palm!

Looks like an olive or grey-green mutation