I'll second eriefisher's thoughts on mono shooting lines. I'm currently using the shooting line section salvaged from a Switch Chucker (originally an integrated line). Word to the wise... don't leave any valuable fishing gear near a bored, labrador retriever. This salvaged shooting line is thicker than mono.
It does three things mono doesn't didn't well for me-
1. Pinches against the cork in cold weather.
2. Makes mending a heavy head easier.
3. Adds just enough drag in the guides to aid turnover.
The only thing it did worse-
It doesn't shoot as far as mono, but it's less than 10' difference.
The pros outweighed the cons for my fishing. I'll be replacing it with something similar when it wears out.
The only reason I bring it up here, is maybe you already have something that would work.
As far as tips for a 275 grain skagit max short, assuming you're rod is 11'-12' long trout spey, I would try either 7'-10' polyleaders or maybe even a light (T8) MOW tip. The closest thing I have to this head is a 305 grain Rio
Trout Spey head, but it doesn't like T8 for me. I prefer 10' polyleaders.