What you, as usual, fail to understand, genoves, is that when you compare numbers, you have to compare like with like, and there are differences in what the numbers in the TAR and the FAR contain. The analyses are different between the two. And the IPCC says, when you assount for the differences in analysis, the two are within 10% of each other (as wikipedia says +/-). Call me cynical if you wish, but on the whole I trust the IPCC more about what they say about their numbers than I do you.
From the FAR:
The central estimates for sea level rise in Table 10.7 are
smaller than the TAR model means (Church et al., 2001) by
0.03 to 0.07 m, depending on scenario, for two reasons. First,
these projections are for 2090-2099, whereas the TAR projections
were for 2100. Second, the TAR included some small constant
additional contributions to sea level rise which are omitted here
(see below regarding permafrost). If the TAR model means are
adjusted for this, they are within 10% of the central estimates
from Table 10.7. (See Appendix 10.A for further information.)
For each scenario, the upper bound of sea level rise in Table
10.7 is smaller than in the TAR, and the lower bound is larger
than in the TAR. This is because the uncertainty on the sea level
projection has been reduced, for a combination of reasons (see
Appendix 10.A for details). The TAR would have had similar
ranges to those shown here if it had treated the uncertainties in
the same way.
Thawing of permafrost is projected to contribute about 5 mm
during the 21st century under the SRES scenario A2 (calculated
from Lawrence and Slater, 2005). The mass of the ocean will
also be changed by climatically driven alteration in other water
storage, in the forms of atmospheric water vapour, seasonal
snow cover, soil moisture, groundwater, lakes and rivers. All
of these are expected to be relatively small terms, but there
may be substantial contributions from anthropogenic change in
terrestrial water storage, through extraction from aquifers and
impounding in reservoirs (see Sections 5.5.5.3 and 5.5.5.4).
http://ipcc-wg1.ucar.edu/wg1/Report/AR4WG1-Print-Ch10.pdf
You will note also that the FAR cites recent research which shows that ice flow increased substantially in the period 1993-2003, and new research has led to an improvement in knowledge of the parameters of ice flow,but they were unable to tell whether that rise would continue, so they essentially didn't include it in their projections. Apparently it has continued since then. They say if that is included it would increase the upper bounds of the scenarios, which would increase the medians.
So they disagree with you. And as a number of researchers have said since the FAR, they think its numbers are very conservative. Sorry.