+0.7 front, and +1.2 rear toe-in .. that's in what measurement unit?
If in degrees, way too much.
If in inches, according to
this (with 24.62" tire diameter) even worse, +2.65dg front, +5.59dg rear, but i doubt something THAT off may go unnoticed or even set that much.
If in mm, +0.12dg front, +0.22dg rear. A bit too much in front, normal in back.
Understeer or oversteer balance is about which car end has more grip vs other. There are several ways of skinning cat, as in - to add or remove grip to one end of car, to change car grip bias.
For example, to add grip - softer springs, more toe-in, softer rollbars, less air pressure in tires, more negative camber. For less grip - stiffer springs, stiffer rollbar, higher tire pressure, less camber.
Just toe-wise i usually aim/ask to dial on twin for zero front toe, and slight toe-in rear (+0.15dg to +0.25dg total toe in (halve that if per wheel. "+" means toe-in, "-" - toe-out)).
Stock alignment for these cars: at front each wheel 0dg camber, 0.0 toe, rear each wheel -1.2dg camber, +0.2dg toe-in. It's a bit understeer-ish bias.
Most "fix" it by adding front negative camber (which also makes better tire wear on track instead of just ripping outer side as if on stock alignment), extent to how much camber optimal depends on use type (DD only or track), with dialing toe close to "stock" of zero front toe and slight rear toe-in (for some stability under accelerating out of corners, or to ease handling when accelerating in straight if/with wheels spinning (eg. if low grip such as wet/snow/ice)).
Simple to aim camber values for closer to neutral/less understeer-y grip balance might be - by 0.5dg more front camber then rear.
What use your car sees? (just daily driving? pushing a bit more? track driving?)
What camber adjustment means your car has? (twins as stock have only toe adjustment. Aftermarket coilovers may have front camberplates. For rear camber adjustment aftermarket LCA might be needed).
P.S. Also remember that "hard" to get rear out might not be just because of grip balance .. but also because if tires may have more grip in general. PS4 have much much more grip then stock Primacies. You really have to push them to loose grip .. not so easy when driving within speed limits and not hooning dangerously, just driving together with rest of traffic. Need to push more (eg. on track), or loose grip in other ways (driving in wet, or do driver inputs to overcome available grip). Understeer or oversteer .. it's more about when one pushes to limit, which end of car looses grip first. With grippier tires you have overall grip limits much higher, not just rear but also front.