im sure you will get better info than i can give you.
i have used the older style and the newer style ej's,,the older style head were a tweeked merkur head..i believe the tweeked was the finish only
for me i felt the older ej's where a bit more aggressive and very similar to the 38c you are using now..the newer ej/muhle head is a bit smoother,
meaning just a bit less aggressive
there is a good chance a ej or muhle razor may not change things enough for what you are thinking
the super speed red tip i have never used but i believe the red tip version is the most aggressive of the super speeds
as i read your post you want a smoother less aggressive razor..
if you are getting razor burn and redness first i would suggest looking into your technique.. before trying a new razor...a slight change of blade angle
can change everything thats giving you your shaving problems
also use less pressure and letting the razor shave you can also be a cure too. the 38c is a heavy razor and well balanced so just the weight of the that razor should be all you need to shave comfortable
a regular super speed is a very mild razor and they are common to get.
not a expensive purchase and maybe you should try one as a monitor razor to help you decide if less aggressive is the best choice for you
anyone can learn to shave with a mild razor and anyone can learn to shave with a aggressive razor..its only a mtter of what feels best to the shaver..
if the blade angle and/or the pressure are not correct, its doesnt matter what razor you use,, you will still get irration and razor burn..
there are a couple side roads to think of to.. for example and smoother blade with a aggressive razor or a sharper less forgiving blade with a aggressive razor..
many smf members feel a feather blade is the sharpest blade today..and find they dont work well in some razors.. yet i have been reading the new feather stainless steel razor works well with the feather blade
so for what its worth i hope my words help you to a better more enjoyable shaving experience