1. Sparkplugs are worn out and a bit dirty from oil. Do the "piston soak" preventive maintenance trick (it works: throttle body, breather hoses PCV and sparkplugs will be clean - and obviously an oil consumption will go down). Put and suck back some engine flush (solvent) into cylinders for an hour or so. To free the piston rings. Common issue in whole FIRE family.
Change ALL 4 plugs (why 3/4?) and high voltage ("tension") wires. Condition of the coil pack module can be roughly judged by "coil charge time" (dwell) in FES or
MES program. Brand new 1,5 ms / average used 2,0 / worn out, weak needs 2,5 ms "charging" time to make a good sparks (not perfect).
2. As for combustion. Do you have obligatory inspections each year in your country? Do the exhaust gas check (note results, take a print). Things like intake and/or exhaust leaks, bad (weak) ignition coils will show up (as high CO and HC content - ideally should be zero).
3. In Evo/2012 even 1,2 8V has VVT (because Euro_5 emissions standard). Your noise is probably worn out VVT wheel and/or exhaust manifold leak (broken studs). It's an 8V (means: valve clearance adjustment, or at least check). Professional "mechanic" should check it during the timing belt job! But most won't do it. Clowns.
4. Oil change interval about 10000 km is OK (no need to shorten it that much - "5k"). You can use engine flush now (once), then don't use it (unless there is a specific issue you want to address). Remember it's a Euro5 (or 6) car = means it has "3-way catalytic converter", it needs ACEA
Cx oils, do not use Ax/Bx.