Welcome to the forums from the Netherlands!
Your ride is an excellent one, I should know as I had one, just wanted a bit more grunt at low revs - the only reason I traded it in.
I had similar problems with regard to reach, and all I found I had to do was change the handlebars for the touring version, which put my arms and riding position in a much more comfortable position, to the degree where not only my stance was better, but also steering and handling improved dramatically - was good, but got a lot better.
Baron make some, sscustomcycle do too.
(just scroll down quite a bit, you'll find the ones recommended for the 1300 almost at the bottom of the page).
Mounting instructions: http://www.1300tourer.com/node/1381
I did get the Baron ones. I found I did need an extension to the brake cables, BTW.
It did wonders for me: I have a bad back, and after fitting these I found it actually is beneficial to my back. Have pain, go for a ride, fixed!
For the passenger I mounted Highway Hawk floardoards, that solved the problem for the hot exhaust for the pillion rider, and is more comfortable too
, and looks great.
Personally I never had any problems myself with the heat from the exhausts on the 1300, but then, average temperature is probably a lot lower here than where you are.
As to the sissy bar: I mounted a Hepco & Becker sissy bar for the 1300, which I think fitted with the look of the bike better than the OEM one, but I don't know whether that is easily available in the USA. It is quite a bit lower and straighter, so less far backwards.
There also is a version with a rack, which is the one I installed, example, couldn't easily locate an example with the XVS1300:
I've attached some pics of the 1300 I owned, so you can get an idea.
One other option I always recommend, is the replacement of the front fork springs of teh 1300 with progressive ones. The 1300's springs are a bit weak, and I found they bottomed out on really bad roads (humps and bumps, not holes). Changing to progressive springs fixed that, and an added bonus was an even better handling/steering. The 1300 is a bike which doesn;t ride liek a traditional cruiser in th efirst place, as it corners extremely easily and pleasantly, no hard work required, or falling over type of thing for that matter, but this made it almost feel like a sports motor, from a steering and handling POV. As it doesn't really cost a lot to have this modification done, it comes very highly recommended!
HTH, kind regards, Wim