There is your problem!!!
Sorry to come down on you but after all your talk and support of Mark and how brilliant he is and all that talk of clean signal radios and milli-volts, scopes, patch cables, and everything else,
Mark is just like the rest of them. turning up wattage because he knows that's what makes the customers happy, She's swinging now on that watt meter!
Fact is and has always been and will always be: You have to quadruple your power to get a full signal strength difference on the other end!
A 75 watt radio turned up to 100w is going to make not one bit of difference!
What it will do is create excessive heat due to increased voltage to the finals to boost the wattage and usually causes IMD.
A high deadkey does the same, it creates a lot of heat that serves no purpose except for the "keydown crowd". It's the same as turning the idle up on your car. It won't run faster but it will use more fuel and create more heat!
I've been saying for years after I learned better and it's what Dallas 543 says, If you need more power get an amp. LEAVE THE RADIO ALONE!
If anything, turn the AMC up because I have noticed most new radio's are cut way back if you desire stronger modulation.