Try to increase more rep up to 20reps so you can hit more muscle fiber..

Are you doing only bench press, or is that just an example? Whenever I experience what you're going through (not feeling sore/fatigue the next day), I change the exercise that I use, or up the weights. I've not done incline bench press for a couple of weeks, and when I got back at it, I could really feel it .

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Change your training by up the weight ,down the rep (6-8 reps), then slowly progress until you can do 12 reps, then up the weight again and down the rep.

Why everybody wants to slim down when this is a body BUILDING forum? 172cm/68kg isn't fat or huge. I'm 175cm/82 kg and I have no intentions to slim down.

Make your own SLIM DOWN/FAT LOSS thread/forum. Just don't post anything "I want to be skinny here". Wanting to be lean WITH A CONSIDERABLE AMOUNT OF MUSCLE is acceptable.

I have to make do with barbell bench cuz my uni only has one 20kg dumbbell, one 12.5kg and a few more lower poundages. All single only zzz... Btw, what exercise to do to increase chest width d? Was it flyes or presses?