I'll have stab at this.
Climb rate will be higher that is a given, you are lighter and at V2+20 you are still slower than VY. It is only when going faster than VY than you will get lower climb rates at higher speeds and negate the lower weight effect.
At the same speed, your climb rate will increase by RC2=RC1*W1/W2 so that is an increase of 13%. At V2+20 you will be closer to VY and further increase your climb rate.
Climb angle will be higher at lower weight too. VX is not very far from V2 (typically) and at V2+20 you are going to have a lower climb angle than at V2+10 for the same weight. However at VX weight is overwhelmingly more predominant than drag so the 10 knots speed increase is very unlikely to affect climb angle as much as weight.
So, climb angle higher too.
Deck angle well that depends on whether the higher climb angle more than compensates the lower angle of attack. You do have a lower angle of attack at V2+20 LW since you are lighter and you go faster. Maybe a bit more than one degree lower (napkin says sqrt(69700/61500)=0.94 or 6% lift coefficient reduction or about 0.1 and at 1 degree per 0.1 CL so that is one degree AoA just for weight decrease plus some fraction of a degree for the speed increase).
Assuming the 10 knots effect on climb angle is much smaller than the effect of weight, the climb angle increases by the ratio of weight or 13%.
So if you have a climb angle of 15 degrees at HW, you'll get a climb angle at LW of 13%*15 = 2 degrees more.
And one degree less AoA.
So a deck angle one degree higher. But it is a close call.