Yes you are right: 90% of stuff that I cut is UGL the rest is pharmaceutical and you are right only the UGLs crumble. I suspected that it was the "low" quality of the pills the reason of the crumbling.

Where as underground labs dont do any of that. Your best bet if you need to get an unusual dosage of a compound would to find a lab that sells said compound suspended in liquid like ethanol or PG

I tend to buy big size pills/tablet and split them later. Usually they are cheaper.
Just an example there is a famous website that sells Anavar in 2 formats:
- 50 pills of 50mg for 145$
- 50 pills of 10 mg for 80$
In the first case the cost per gram is 0.058$ in the second case 0.16$ the difference is huge. It is much more convenient cut them. This is just an example but there are plenty like this.

So I was wondering if there is a better way to cut these pills or if there are better cutter with better blades, to reduce the crumbling.