Removing the health penalty makes sense, since it affects all archers (elephants, champion chariots, etc.), not just citizen infantry.
This technology is already quite expensive, especially for a village phase technology; making it more expensive is not an improvement; how about making it cheaper but less effective? E.g. something along the lines of:

		{ "value": "Attack/Ranged/PrepareTime", "multiply": 0.9 },
		{ "value": "Attack/Ranged/RepeatTime", "multiply": 0.9 },
		{ "value": "Attack/Ranged/Spread", "multiply": 0.9 },
		{ "value": "Cost/BuildTime", "multiply": 0.9 }

In D2876#123601, @Nescio wrote:

Removing the health penalty makes sense, since it affects all archers (elephants, champion chariots, etc.), not just citizen infantry.
This technology is already quite expensive, especially for a village phase technology; making it more expensive is not an improvement; how about making it cheaper but less effective? E.g. something along the lines of:

		{ "value": "Attack/Ranged/PrepareTime", "multiply": 0.9 },
		{ "value": "Attack/Ranged/RepeatTime", "multiply": 0.9 },
		{ "value": "Attack/Ranged/Spread", "multiply": 0.9 },
		{ "value": "Cost/BuildTime", "multiply": 0.9 }

Champion archer already has a very high rate of fire, that would be bad. How about just lower the cost a bit, like 600w/350m?

25% training time reduction and 20% less spread seem rather powerful, especially without a penalty to compensate, I think 10% would be more appropiate. And the range increase could be lowered as well, perhaps +8?
I'm just floating some ideas to consider, other suggestions are certainly welcome.

Up patch. Suggested values by @Nescio.

Up patch, new values by @Nescio

Could you also generate the patch from the root eg the folder where there is source, binaries, libraries build etc, not the folder, and add context

svn diff -x -U5000 .

Current ranged soldier maximum ranges:

24 basic infantry javelinist
28 basic cavalry javelinist
28 champion infantry javelinist
32 champion cavalry javelinist
32 hero infantry javelinist
36 hero cavalry javelinist

48 basic infantry slinger

72 basic infantry archer
72 basic cavalry archer
76 champion infantry archer
76 champion cavalry archer
80 hero infantry archer
80 hero cavalry archer

Since they're all multiples of 4, how about changing the archery range bonus from 10 to 8?

Edit

Consider that increasing the range reduces the spread at equivalent-distance. I don't know if the current values are fair.

You are still increasing max range by 10 despite the tooltip.

Sorry, i forgot attack range, i cant change now.
@Nescio you can change for me, please?

Consider that increasing the range reduces the spread at equivalent-distance.

Good point! Maybe limit this technology to only a training time and spread reduction (and make it even cheaper)? The range increase could go into a separate technology (or a civ bonus).
That could also be explored in a future patch. The current changes look good to me and are already a clear improvement.

In general I disliked our "tradeoff" techs, since the tradeoff is already present in the resource cost.

Exactly!!!