Unupped
DR 1
Backlash 1
for (curently) 3

Upgraded
DR 2
Backlash 2
for (currently) 4

+1upgrade
The upgrade is too much.
Unupped
DR 1
Freezing 1
for 6

Upgraded
DR 2
Freezing 1
for 7

+1upgrade
An upgrade, +1cost balances out a 1->2 DR change. The additional backlash (if kept) would need to increase it more.
I believe healing 2 hp to be equated with dealing 1 damage (see bolts). So DR 1, backlash 1 is worth DR1 x3 (multiply before the -3 reduction due to limited slot)
[note

is used as generic elemental quanta below and is not associated with the team,

quanta or a new element]
Shield
DR 1
Cost: N-3

=1

N=3

+1

Mind Shield
DR 1, Backlash 1
Cost: 3N-3

=6

+3

~=7

Tower Shield
DR 1
Cost: N-3

-1upgrade(comparison to Titanium shield shows this to be a -1.5 upgrade)=5

N= 4.5

+5

Telekinetic Shield
DR 1, Backlash 1
Cost: 3N-3

-1.5

(upgrade)=9

+15

~=14+

So a 7

|14

cost seems called for (7

|6

if the upgrade is changed to a cost reduction from the unupped)
Also while the name would need to be changed, isn't this Backlash a Darkness mechanic?