Remember, the weight of the rod (4 vs. 5) is not the only factor, if at all, when determining a rod's "delicacy". The "delicacy" of the rod also is influenced by its "action". I currently fish with two 5 wt Sage rods for trout. My 590 SLT is very smooth and "delicate", and is perfect for dry line chironomid techniques. My SLT allows me to slow down and open up my casts while tossing a 20+ foot leader. My other trout rod is a 590 VPS (which is Sage's RPL blank). The VPS is a nice rod with a faster action than my SLT. Casts like a rocket, but also feels like a "telephone pole" compared to my SLT. Not a fair description, as the VPS is a nice rod indeed. I've also casted the Z-Axis 590, and it casts a mile as well, but I much prefer my SLT for "soft" casting and delicate presentations.
Good luck and have fun!!!
problem is the VPS, Z-Axis, One and a few others by Sage are fast/ultra fast action which means only the top 1/3rd of the rod actually does the work while casting. These rods will give you a lot of lower end power when you need it though. Your SLT sounds like a moderate/mod fast meaning it should flex deeper towards the cork and you may find you "have to" slow down to allow the line to lay out before changing direction. I notice this mostly when I'm playing with new spey rods and prefer the slower full flexing rods as well
Each rod has its place, and I to prefer slower single handers when I'm tossing indicator rigs, for sink type lines a fast action is better because it can give you the distance needed quickly.
Enjoy your trip to Tunkwa/Leighton this weekend FFM