Idea on how to REALLY fix the spgs?

Draschel: Proper fixable solutions for SPGs not even on the list.Either: 1)Make them tanks destroyers, and appropriately buff their HP, view range, aim-time, accuracy, DPM. Give them normal HE rounds, and HEAT as premium2)Limitation of 1 per side, nerf their penetration by 80% to remove the unfair and common roof / deck pens. Decrease splash damage but place in minimum damage effects Decreasing splash damage, but allowing for minimum damage effect, are very important. SPGs should not be like T92 or S51 in respective tier, miss the target by 7m and still splash for 400 damage. Likewise, the polar opposite is needed too. A poor SPG like Bat Chat 158 should not be directly hitting Maus or Type 5, and  dealing  0  damage critical with that hit. Fairness operates both ways. Decrease the damage dealt by non penetrating splashes, however remove those obnoxious 0 damage direct hits that not only infuriate artillery but also massively buff armored tanks. This is a huge problem, because artillery understands this by experience, don't want to waste shots, and instead focus on light and medium tanks, that they can actually damage reasonably, rather than assisting the team more and focusing on things like Maus and E100