Whatever you do dont go down in plumbing size! This will just make things worse. Your 1060 should be fine, I use the same, the top of my tank is over my head so about 2m the actual outlet in the tank would be 1.5-1.7 meters above the pump. I think you problem is that you are just trying to do too many things with it, every foot of plumbing, bend, join, tap, tee, etc etc slows the flow down more.
An eheim cannister will make bugger all difference to your flow, depending on the model they are only rated to like 700lph and this is if you have no media no pipes etc, you want to be looking at 1000's of LPH. Also if you want to add a cannister for phos-sorb etc why not get a cheaper one, I use a fluval 204, I ran two of them them on my fresh water tank for a couple of years, and one has now been running on my marine for almost a year, I have never needed to replace a part or haad any problems. You can pick them up for under $100 off trademe, and anyway because you using it to hold chemical media, it doesn't really matter if its off for a few days like it would if it was a bio filter.
However I would be looking at a fluidized filter, I have just ordered one from oceanworkz (or whatever they are called) cost me about $150 landed for the larger size.