"I'm on the verge of selling the bike."
There's a lot of choice these days, unlike when the bike was designed. My Moulton wasn't very well finished, it had cheapo wheels, and a paint run under the bottom bracket. It also came with a £25 Sturmey Archer crankset, leaving the feeling that you'd bought a £300 bike with a £900 badge.
Adding a Hollowtech Tiagra double to the front and 105 to the rear for 18 speeds, didn't make it any more fun, just more expensive.
A few years ago I had a Downtube 9FS. Suspension front and rear. That was more fun than the Moulton, for whatever undefinable reason.
I'm no judge, I'm riding a $220 supermarket bike now, that is fun.
I think you're not going to improve the acceleration by adding more stuff. Contrary to the usual thread progressions on here, the best way to improve acceleration is to take stuff off. :-)
If you don't need the comfort of the TSR, sell it while the paint is still good and the user-hype high. Buy something else.
Last edited by snafu22; 11-20-16 at 02:37 AM.