Yes agree with all the above: First thing DONT GET FRUSTRATES/DISSAPOINTED....go to Rig Exchange (download & install rig manager first)..and start to try some. Don't spend ages trying to 'polish' something that isn't quite right for you...load them in try them give them 20 seconds, play some power chords, delete it straight away if you don't like it....BUT JUST KEEP GOING.
Don't spend hours at a time doing it...your ears will give up...just do a bunch at a time then take a rest. Rig Exchange has some really good FREE ones but you have to find them...just find one that sounds pretty good from the get go and tweak to personal taste from there.
Yes as above, tweak at gig volume, don't set patches up at low volume and then crank it at a gig...it will sound terrible. Kemper tones can be frustrating, many sound muddy and not great especially many of the 'high gain' ones but they are out there. If you buy professional profiles, well some of them can be a bit disappointing too...so try a few of their free ones see what they are like generally..remember most of them are done in top end studios with the best gear and I have no doubt they sound fantastic in their mixing room...sometimes that doesn't translate into our world!!
Don't give up, many do...I did, I was one of those!!...went back in the box, got it back out 6 months later and now I love it. It helped that I found a great profile for 'Rock/Metal'...well for me and my ears/gear anyway....what is it...not telling...its a secret... sorry.
Nah...not really I used a free profile on Rig Exchange, its a EVH 5150iii profile by a guy called Brendan...just search under his name, he's only done two which is a shame I thought they were/are great....again I tweaked to my taste, played with amp settings, presence, clarity, delay etc all that fun stuff...but it is my go to rock/metal profile...perhaps try that one?? Again it may not work for you.
Ive plugged this patch into the return of my valve amp and into my 2x12 cab...even kept the cab emulation ON...just adjusted presence and it sounds massive...really. Remember there is no right or wrong way...just let your ears tell you everything you need to know...if it sounds bad..it is...delete it & try another! Also everyones gear is different, different monitors, different amps, different cabs etc...that's why some profiles work and some don't.
Everyone has different ears...they're are no 'BAD' profiles on Rig Exchange (they are free lets not forget and I personally thank everyone who has taken the time to upload them for the likes of us to try) just ones that arnt for you...just keep loading, auditioning until you find the one for you and rock out fella!
You will get there.