That is a bug. Worn haste should stack for archery. Do you have another item you can check with to make sure it's not an issue with Swiftwind?

Quiver haste is only 1/3 of it's WR roughly. So, a fleeting quiver would only give 20% bow haste.

Here is the actual code the game uses to calculate haste as of now.

Haste is calculated in zone/client_mods.cpp:

Code:
1029 int Client::CalcHaste() {
1030 int h = spellbonuses.haste + spellbonuses.hastetype2 + itembonuses.haste;
1031 int cap = 0;
1032 int level = GetLevel();
1033 /*
1034 if(disc_inuse == discBlindingSpeed) {
1035 if(!disc_elapse.Check(false)) {
1036 h += 20; //this ammount is completely unknown
1037 } else {
1038 disc_inuse = discNone;
1039 }
1040 } */
1041
1042 if(level < 30) {
1043 cap = 50;
1044 } else if(level < 50) {
1045 cap = 74;
1046 } else if(level < 55) {
1047 cap = 84;
1048 } else if(level < 60) {
1049 cap = 94;
1050 } else {
1051 cap = 100;
1052 }
1053
1054
1055 if(h > cap) h = cap;
1056
1057 h += spellbonuses.hastetype3;
1058 h += ExtraHaste; //GM granted haste.
1059
1060 Haste = h;
1061 return(Haste);
1062 }

As you can see, there is nothing for quivers at the moment.

As for the question on decimal rounding on weapon damage, there was a long debate on the eq station forum quite a long time ago that was answered by a dev, and talked how some numbers such as damage displayed were rounded to the nearest whole, while other calculations truncated the decimal, such as weapon ratio, AC and I believe attack. This post was also on the Steelwarrior site, but unfortunately both of the links are now defunct. I remember seeing various posts mentioning the rounding here as well.

To answer the question about why you want the highest base damage bow when using Trueshot, it's simply because bows do not get a damage bonus, and RNG will screw you over more than not. So, when you have a higher minimum hit consistently for a limited duration, the weapon will DPS higher, whereas a lower ratio weapon will out DPS over an extended time.

We did an experiment a long time ago over on the rangers glade before AA's were introduced and found more than not, a higher base damage bow would kill the higher ratio bow, when using max haste, but only during Trueshot. I'll see if I can dig up some old spreadsheets or logs.

Yeah, a RBG. Testing in a sec.

That doesn't make sense. Trueshot is just a damage and accuracy mod and it affects all bows equally. It should be no different than comparing two bows without haste to two bows with haste.

Parse for yourself and see. I know it sounds backwards, but the numbers will show.

Well this is getting interesting.

Windstriker w/ RBG (27%)

[Fri Jun 19 17:15:24 2015] You hit a thought spoiler for 72 points of damage.
[Fri Jun 19 17:15:30 2015] You hit a thought spoiler for 66 points of damage.
[Fri Jun 19 17:15:36 2015] You hit a thought spoiler for 72 points of damage.
[Fri Jun 19 17:15:43 2015] You hit a thought spoiler for 64 points of damage.
[Fri Jun 19 17:15:49 2015] You hit a thought spoiler for 93 points of damage.
[Fri Jun 19 17:15:55 2015] You hit a thought spoiler for 63 points of damage.
[Fri Jun 19 17:16:01 2015] You hit a thought spoiler for 87 points of damage.
[Fri Jun 19 17:16:07 2015] You hit a thought spoiler for 35 points of damage.
[Fri Jun 19 17:16:13 2015] You hit a thought spoiler for 25 points of damage.
[Fri Jun 19 17:16:19 2015] You hit a thought spoiler for 81 points of damage.

Looks like a 6 sec delay for all of those shots besides one. So no difference for 0%, 27%, 40% worn haste on bow shots.

Something is definitely not right with that. Worn haste has always affected archery for as long as I can remember. Anyone else seeing this issue?

Kinda hard to parse without the discipline!