Regarding the oil consumption. Just be careful that these numbers you quote are realistic, it is not uncommon for Robinson to vent oil and find a suitable "usable" level.
For instance you fill your 44 upto 9 Quarts, within the first hour the engine vents 1 quart out of the oil breather (not burning it). This engine can then take 5-6 hours before getting anyway near the 7 Quarts lower limit. But if you keep filling back up to 9 Quarts each time then it appears to be using a lot of oil. This just springs to mind as you mention oil mist on cowls etc.
Regarding the low power, have a look at the figures for the compression check at the 100hr.
If you're not happy with the machine - don't fly it!