Ah, an LT convert.
I had this exact conversation last night with another ex-LT rider, who has the same complaints.
My Bill (Rocky) Mayer GT seat is excellent. I sit firmly but comfortably in place, and have done two 1,000-mile days already (only 5,400 miles on the bike so far). I don't slide around at all, and I don't squirm no matter how many hours I've been riding. I did have them put me as far back as possible (longer '07 seat pan) to help minimize knee bend.
A lot of it has to do with your own dimensions, and what you're used to. The LT sure is a comfortable bike, if a bit heavy and relatively underpowered.
I put the Helibar risers on the day I picked up the bike. And yes, I need about another inch or so more reach. Helibar adds 25mm (1 inch) back at the highest stock bar position, but that's just not quite enough. Suburban Machinery has a kit due out soon that will also give 25mm back, but will allow for three height positions. I think that the tallest is still only the tall stock position though.
Wunderlich is also about to release a kit that will give 25mm back, but an additional 40mm height. I'm pretty sure this is above the stock tall position. If so, it might be just about perfect for us ex-LT types. It should be available in July, and I'll be chasing this one down.
'13 Dark Graphite Metallic K16GTLD, 24K miles and counting...
'09 Magnesium Beige Metallic K13GT, 60K miles miles and counting...
'02 Mauve Metallic K12LTC, 106K miles and sold
BMWLT#145, IBA# 366, MOA# 111996, SCMA# 24032
All lower 48 states plus Alaska on the K13GT in two weeks . . .
Some people see the gas tank as half empty. Some see it as half full. All I care is that I know where the next tankful is coming from...