I use a circa '71 Gibson Les Paul Deluxe with stock mini-humbuckers and an '82 Ibanez Ar305 with a Seymour Duncan Jazz Neck and Seymour Duncan SH-4 in the bridge (and a nice onboard Waldo Unity Gain Buffer - sweet!). I don't think your guitars (or your playing) are the issue but suspect its more of a holistic issue understanding how to tweak everything the Kemper gives you access to, combined with the uniqueness that is inherent to your particular set up (power amp/monitor). Very, very few profiles are going to sound 'just exactly perfect' right out of the box, so to speak.
I will say that even though I am extremely happy with the tone I get from the Dumble Pack rigs that I use, I have never bothered trying to A/B it to Michael's samples. Also, I have absolutely no problem tweaking his profiles to suit my needs - in fact, none of my live/practice rigs are 'untweaked'.
I'll offer my approach - take it or leave it. When I purchase a pack I try to do a test run of every profile in the pack, cycling through them in Browse Mode. I keep a notepad handy and jot down thoughts/emotions that different rigs give me. I especially make note of the rigs that I wind up 'getting lost' playing. I then prioritize the top 3-4 (sometimes more). Then I go to performance mode, and create a new, separate performance for each of those top rigs. I copy/paste the same rig in each slot. Keeping the first slot 'pristine and untouched', I then tweak the other four according to whim and experimentation. By all means I suggest you thoroughly explore all the options including the regular Bass/Mid/Treble controls on the face, not to mention the various EQ's available. Last but definitely not least, learn the 'special tweaks' the Kemper gives you access to (Definition, Power Sagging, Pick, Compressor, Clarity, Tube Shape and Bias).
Give it a shot, spend 'some' time. I find it hard to believe you won't be able to get just about any profile (let alone those from the Dumble pack!!!) to sound close or exactly to what you really think or want it to sound like.