right, choices of good-quality pbt backlit caps are limited in general.
scratchiness is a non-issue as long as they are lubed properly.

again, it's better for you to try out first-hand to have better experience, instead of reading user comments. most of the times, user comments are very subjective, and are based on their own preferences.

good luck

 

 

er.. not too sure what happened to your switches. which switch are you using now?

switch lubing means making your switches smooth during key travels, from and back to its resting position. in essence, it mainly helps minimize scratchiness (mainly due to frictions between sliders and housings when you type), and spring noise.

you should try out a few lubed switches first to see if it solved the issue.

could it be related to tactile bumps? you said you have tried kailh and gateron, are they brown/tactile too, or different switch types?

i'm not sure what happened to your switches, so i can only tell you the main purpose of switch lubing. yes it sounded like lubing will not solve your issue, because we might not look at the actual cause.

there are few options about a full tkl kit with swappable switches, e.g. drop's ctrl tkl, and gmmk tkl (both use kailh switch sockets, so they can support switches other than outemu)

you can try out tecware phantom elite tkl.

i have both phantom elite tkl and ctrl. both can be much better after tuning.

I probably just aim for TKL for this round as they are more option I can choose from. I found a used Durgod K320 at a reasonable price.. Currently my choice is between Durgod K320 and the IKBC CD87. Durgod used at around rm 250, IKBC new for Rm289. Which will be the better choice?
If I decided to play along in the future, I may pursue in finding my ideal 75%.... at the moment, I can't wait as I have no keyboard to use
Thanks for the recommendation.  I looked into tecware phantom, it definitely is affordable option but I really don't like the "look" of it..  I hope to get one that I like, and can use it for a long time... Hopefully I won't get trap into this endless searching for the "endgame" ... 
But..for tecware phantom elite, it means it is possible for me to swap all the switches & keycap in the future? They are using Gateron switches which I have not learn about them yet.. are they as good as Cherry Mx?