First thing Singaporedream.
Clutch: When you say "clutch is engaged". Do you mean when the lever is in or out ??
Engaged means you are not holding the lever in and the plates are together and driving the gearbox. You need to check it you can stop the wheel with your foot when the clutch is disengaged (pulling the lever to the bar)
Mechanic using glue on your clutch ??? I AM VERY WORRIED !!
Battery: Your battery should have 12.5V when bike is off. If not, the battery is not healthy or it is not being charged by the bike properly.
Oil: 20w/50 is SEMI sythetic is fine for the AT as long as it is for motorcycles !! If it is for cars then there may be additives which are bad for motorcycle clutches.
If oil is seeping from the LH side round hole then yes, this could explain your problem. It only needs a rubber 0-ring but it might be hard to find the correct size. Make sure it is tight.
Valves: How many miles since valves checked ?? You should really check every 12,000 miles but the AT seems to stay in spec for a good while longer.
If they are bad, you will lose power, economy and in bad cases, make the top end wear out quicker.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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