Sett's Kit could use some improvements

Dunno about you guys but I've been watching a lot of Sett Gameplay lately and heard people's opinion about him, and it seems that he's pretty underwhelming unless fed in most of scenarios, from ranged to jugg/bruiser matchups.

I therefore think his kit could use some changes, and have something written down as proposal changes:

How about giving him some lifesteal on Q empowered autos? Although it seems like too many things are centered in one spell this way (MS, AA reset, %hp dmg), so maybe it's better to improve his passive health regen during combat (maybe based on enemies he's facing)? Maybe make the Q MS last longer instead of making him faster? Either would be good I read someone suggesting to make his Q have 2 casts, the first for MS and the second for the AA reset, so you don't have to sacrifice a useful dmg output mechanic just to engage.

Regarding W I think it's a fine spell, and with the buffs on PBE it's even better. They should just make the shield last 2-3 seconds and THEN quickly decay tbh. Dunno if they should make it scale harder on AD or HP, but the hybrid scaling seems pretty fine to me.

E though could use some range fix/buff, and remove the Flash lockdown so you can E>Flash, giving him some cool stuff and other setup to Insec.

And now, his R. It feels pretty underwhelming when used on squishies. My idea is to make it scale a bit on Sett's HP/bonushHP and a bit on the opponent's bonush HP, so you have some consistent damage going and the extra on heavy targets.

What do you guys think?