I have an IQ180. I used the SK 47 XL for a couple of months and sold it. Compared to the HR40mm, there is a significant difference even I can see it
I have no doubt about you.
For 60-70mm range, the SK 60 XL (bought from Guy) or 70mm HRW are outstanding (at the moment, I've had both).
If I were you, I will be patient with the lens choices as they will be hard to sell if you don't like them. It's not a big market.
I have HR lenses 23, 28, 40, 70, 100mm and they are excellent with the IQ180. I did lots of researches (and I am a medical researcher) and looked like you don't have many choices for IQ180. It is a painful path but you have to accept it. If you keep buying and selling, you will loss more.
If you can trade your IQ180 with IQ260, you may be able to save some money with the lenses for tech cam. Something to think about. I thought about it but finally decided not to as I love my IQ180.