the clutch issue is most likely caused by an issue with the clutch line. may just need a bleed.
as for the power issue, it may be an issue with the afm, spark plugs, fuel, cooler piping, etc. i'd start with a new fuel filter, new spark plugs, cleaning the afm and checking the cooler piping for leaks/hose popped off. checking the ecu for fault codes would probably be a good idea too.
and did you put 10L of injector clean/octane boost in? if so then that won't be helping your cause. you would be better off draining the fuel out and putting fresh fuel in.