Looking at these two sticks to use mainly for 3/8oz bladed/swim jigs + trailer and 3.8-4.8 keitech fat swing impacts with a 1/8-1/4oz weighted hook in sparse to moderate weed growth. Would love to get some feedback from those of you that have used both of these sticks. Not sure if the Diablo Spec R would be slightly underpowered but I like the shorter length over the EMTF for more precise casting. Thanks in advance.

I haven't had the pleasure of using the EMTF. Based on my experience I don't think you'd be overloading the Diablo with those weights though. Though I've not fished the Keitechs on my Diablo at all, and swim jigs and chatterbaits sparingly those weight ranges have posed no problem for me. My understanding of the difference between the two is more taper then power, the Diablo leaning more towards a ModFast and a bit more forgiving for moving baits. 

I have used both and still own the DSR. I use my DSR for exactly what you are planning on using it for. I was using the EMTF for 1/2oz chatters and it was just a little on the light side for me for that, so actually sold it. The dsr is dedicated for me to 3/8oz chatters usually with a rage craw trailer, and swimbaits in the 3.5-5" range with a 1/4oz or lighter head, so right in line with what you are planning on using it for. 

Thanks for the feedback guys! Looks like the DSR will be the next stick I pick up.