If your bike is newer than 95 the stock carb needle would not have an E clip or grooves. and it would not be tapered. If your using the newer carb body neither one of the needles is correct. A stock bike should run 85-87 mph ,you have a larger piston at higher compression ,and you can't break 70 ? something is wrong.You may be getting better mileage ,but you may have gone from running very rich , to  running very lean (more dangerous)an could damage your motor . I would not be letting this go.I'd be looking for the problem.

Your right ,I had to take a look at the carb  drawing. My mistake there is a E-clip ,If you took out the white spacer and placed the two #4 washers in the same exact place the spacer was your OK. If your running a 145 stock main then it's the reason you can't achieve a higher top speed ,you'll have to go to a 150 or larger.

We have a winner! Yes putting the washers in in the wrong place actually allowed the needle to move up the entire width of the white spacer, rather than the room the 2 washers would take up (about half) this would cause you to run to rich from about 1/4 to WOT.
        I had an old farmhouse 4500 sq.ft.  with 10 ft. ceilings and plaster and lath walls I gutted and sheet rocked  ,the older you get, the heavier it gets.

So I pulled the top side of the carb back apart this morning and repositioned the spacers/washers to where they are supposed to be and wouldn't you know it... The bike started trying to cooperate with me!
It pulled like a freight train up to 35mph in 1st and had a slight hiccup... Smooth through the rest of the gears. After about about a 15 minute ride I guess everything finished warming all the way up and the hiccup cleared.

I'm still thinking (and agree with Batzy) that it will probably like a 150 or 152.5 main jet a little better than the 145 that is in it.

You'll be lucky to crack 80 mph going downhill.  So be more concerned with how it gets from 60-75 mph.  That's what I worry about.  I found that my bike is more responsive on the lean side.  

The PO had a 55 pilot and a 155 in my bike.  It sounded nice, but performed like a turd.  Had to down shift going up hills, was a pig on fuel, spitting wet carbon exhaust all over the back wheel, etc.  

Went back to stock and it could idle up hills in 5th gear (slight exaggeration) and accelerated quicker.  So quick it would flatten out fast, which made it feel almost slow, like it wasn't pulling as hard.  But the bike was topping out in each gear quicker with less noise (a cleaner, quieter sound) that made it seem like it lost power.  It pulls better at highway speeds but gets really soft at 75 mph.  

It runs so well off the bottom, I almost don't want to mess with it.  It's really fun to short shift it.  I would like it to pull each gear just a tad longer so I'll mess around with the main jet a little more but I can't see ever going as rich as the guy I bought it from.

The jet set from Lancer was waiting on me this morning when I checked the box. I put the 150 main in and replaced the 52.5 pilot that was in there with the new one that came in the kit. Gonna go see how it acts in a bit... waiting on the bike shop to open up to see about getting a fresh filter. It is oil change time.

Has anyone talked about oil?
The dealership isn't gonna have the one the Savage needs.
Cheapest, Good oil is Shell Rotella 15/40