Low pressure
There are couple of reasons I can think of for the low pressure issue.
1. Ground level not fine enough
2. Dosing is too small
3. Channeling
So I got three questions for you:
1. May I know your current grinder and your grinding level? A image for the ground particular would be helpful.
2. What’s your current dosing amount? The less dose, the finer ground it needs. So if you are using the smallest dosing amount like 15g, then a finer grind level is needed for the extraction.
3. This is the hardest part. If you are using a small dose like 15g, a good WDT work is essential, since the puck would be relevant thin due to the small dose.
I would recommend you to add the dosing amount to higher level from 15g to like 18g or 20g. If you are already using an 18 or 20g dose, then try grind finer and do a bit longer the WDT work for best evening the dose.