Suggested

Reduce to tire gaps

Tire gaps are HUGE. In the perfect conditions, the supersoft tire is 3 seconds a lap faster than the soft. SOFTS and super soft  are the best tyres at 90% tracks. This creates a lack of different strategies  and in turn sometimes results in boring races. I fell like this needs to be changed. The biggest example is the speed of hards which are at least 3-4 seconds slower than mediums and we cannot even run high fuel loads for long stints as it further reduces the speed. I think the tyre pace difference should be reduced to about 1 second between each tyre at the maximum 

The gap between ss & soft is actually less than 1 secs per lap not 3 secs as you mentioned, this's because usually managers will run longer stint in harder tyre, longer stint needs heavier fuel, heavier fuel will slow down the speed of the car. Try to run different tyres in the same length stint and you will find that the gap is actually less than 1 secs only. There's a special case in Japan, running ss is slower than running in soft tyre (coz tires wear gone fastest in Japan although did PL1). Harder tyre is quite effective in some of the tracks (Monza, Sepang, Bahrain, UAE) which temperature very high. 

I wanted to say at maximum the gap can reach a lot

Maximum gap between different tyre, perhaps is 1.5 secs to 2 secs (Doing PL5 on ss tyre & at the same time doing PL1 on soft tyre in different drivers at the same time & same length stint). I don't see the maximum gap has reached a lot like your mentioned (3 secs). Maximum gap 1.5 secs between different tires and different push level is very reasonable and I don't see any issue on this. Devs really did a great job on this.