50 watts DK is way to high to get any good modulation out of that radio. Those final mosfets will not last long at that level. You will be sending it back anyways so to stop the bleeding and think of it as a 70 max watt radio, divide by (4) to get the proper 1:4 ratio equals 15-17 watts DK for optimum modulation. Set it there...You can do it!
I'm consistently getting HiFi audio reports with just the Stryker 497 set with with a pinch of reverb running at 5-7 watts DK pushing a HD (4) 2sc2879 box and a
good Turner +2 desk mic. Now the secret is out