First you need to make a local copy of the mod then go into your documents then go into teardown then mods and go into infinite cable copy. Go into main and scroll down. If you see place distance thats how far you can place the cable you can change it to whatever you like!
Then keep scrolling untill you see this

function SpawnCable(from,to)
local fromString = table.concat(from," ")
local toString = table.concat(to," ")
local style = cableStyles[cableIndex]
local ropeXML = '\
<rope color="' .. style.color .. '" slack="0" strength="' .. cableStrength .. '">\
<location rot="0.0 0.0 0.0" pos="' .. fromString .. '"/>\
<location rot="0.0 0.0 0.0" pos="' .. toString .. '"/>\
</rope>'
Spawn(ropeXML,Transform(),false,true)
end

Change slack to something negative (i use -0.4) but you can change it to whatever you want! However if you change it to 1 it will be completley straight

Also i recommend you dont change anything else since idk what the other stuff does.

Hope this will solve your problem with the cable not being tight enough!