I was going to say mix it with lactose, but you already said that ends up being too much powder to snort. I would suggest trying lactose again, but using less of it so you don't have as much powder. You really should not need to use 10x as much lactose as you have dope. Take JamesBrown's advice and try using 2-4 parts lactose to every 1 part tar, which means use .2-.4 of lactose for every .1 of tar. If that doesn't work, then mixing it with any other powdered substance is pretty much going to give you the same results.
Also you could try the liquid nasal route again, but use more water so it might be tolerable that way. It would be helpful if you explained why you didn't like doing it this way so others could give you some tips on better ways to go about doing that.
Thirdly, better IV technique is definitely something you need to work on if you have no usable veins. I don't know how long you've been IVing, but if you do it correctly, are sanitary and sterile when you do it, you should be able to IV for quite a period of time without much damage being caused. It might be beneficial for you to look through the OD directory for the link in there on proper IV technique.
That's about it on my suggestions for you. Making tar into a powder is about all you really can do and it'd be the same results as mixing with lactose and just about any other powder I imagine, so bottom line is retry the lactose thing using less of it and if that doesn't work, try my suggestion to liquefy it, but using more water to possibly make it more tolerable to have in your nose.
P.S. You said you didn't mean to come across as rude, but perceptions are everything, so keep that in mind for next time. If you're calmer and a little less abrasive in the way you post, the community here will be more receptive to your and your issue and be more open to giving you quality solutions as well.