Will be spinning with 4500 Penn Spinfisher. I normally use the KL-H guides but I want a little more durability. Line will be 20-30lb braid. What train would you use for the KW guides?

I am a big fan of starting with a kw stripper then dropping down to kls and kt runners. For instance kw 30-kL 20-kL12- kt runners of your choice. Another option I like is to use double foot reduction guides to single foot runners. It’s a combination of durability and weight savings.

How about KW30, KW25, KW20, KW12, KW 10 or 8 runners. Another option is KW30, KL20, KL12, KT10 or KT8 or KT6 runners.
Norm

Whats the power and lure rating of rod? Unless you foresee alot of falls on rocks and abusing the rod i would go with a single foot of kr build

If you're using a tiny spooled 4500 Spinfisher with braid as light as 20-30 pound you want to go MUCH smaller on the guide sizes especially on an 8 foot rod. I build all my surf rods these days with a stripper no larger than a size 20-25 ring . Anything larger causes a dramatic loss in efficiency and add's excess weight unless you're using mono or flouro as your main line . For the best performing spinning setups utilizing braid, layouts will have transition trains along the lines of a 25 or 20 size stripper dropping all the way down to a 12 or 10 then a size 6 or 5 as a choke and equally sized runners. Fuji's KR single foot concept guide types are far and away the best choice for a 4500 spinfisher using 30 pound braid .

I personally would avoid guides that are close in sizing for a reduction train on any size rod but especially for an 8 foot inshore rod with a very small spool diameter . Guide trains like 50, 40,30-20-16-12-8 are awful choices when the line choice is braid because the extreme suppleness and lack of memory of braid doesn't need anywhere close to that amount of open space inside the ring . It equates to nothing but lost energy & a guide frame that's heavier than necessary. With a more traditional layout like 40,30,20,12,8,8,8,8,8 very little changes to the line path from the size 40 stripper down to the 12 ring . With mono this is OK but with braid it's terrible. That setup would be fine if you were planning to use stiffer mono in the 20 pound range but with braids you lose a tremendous amount of energy with it and add a ton of extra weight . The largest stripper i will use these days is a size 25 ring and if a size 20 ring has the appropriate height i will choose that every time over the 25 size ring because it provides better performance than a 25 ring does although slight, ( the smaller the stripper size you go the more the line seems to accelerate) and this is because the ring diameter does not allow the line to move much inside the ring which conserves all that energy and directs it forward. Many call this phenomenon The "cannon effect" because it really feels like the line is being shot out of a cannon. You will not experience this at all if your stripper choice and the rest of your reduction train is using guides that are larger than needed but the setup will still work beautifully, it just won't be nearly as efficient as it could have been . IMO 95% of builds have guide trains that are much larger than necessary especially running guides and that's no disrespect just an observation , i also think the overwhelming majority of guide wraps are much much longer than necessary but many prefer that.