I use a agamarix jazz from my doctors. Sure it's the cheapest thing they could get as every few strips it gives errors.
Perhaps try increasing your needle depth to get a larger sample?
Ring the company and tell them what's going on and say your GP is not going to let you have any more test strips due to the wastage. Hopefully they will provide you with more test strips and a new meter.
I used to have an Accu-Chek Mobile Meter and same thing happened to me and I had plenty of blood on tip of my finger, I also didn't trust meter in end as it was giving dodgy readings so I switched to Contour Next USB from Bayer, couldn't be happier with meter only downfall finger Pricker is a bit hit and miss.
The Mobile does need more blood than other meters. I have one but the replacement cassettes were too expensive, so I bought a Codefree. Much less blood needed. I did have lots of errors as you describe.
Just to let you all know I been on the phone to accu-chek and they said they have upgraded the cassettes so they give more accurate reading .But this have made them more sensitive ! So they said to make sure the
Meter is on a table when you use it . Thought it was meant to be mobile lol