what combat jungle buffs you talking about?
also "lategame" isnt full build. lategame is like 3 items and at 3 items you could either have devourer, gunblade, deadmans plate and be some sort of bruisery auto-attack akali or you could have gunblade, deathcap,lichbane and oneshot everyone.
always remember that auto attacking takes time and requires you to be free to move and attack.
i will give you an example. in season 5, the most popular shyvana jungle build was devourer botrk because of how well shyvana synergizes with attackspeed and how botrk synergizes with sated devourer even more. it really was the highest DPS build possible last season.
now i was (am) the best shyvana player on EUW and for the later half of season 5 i used not botrk but titanic hydra as second item on her. why would you do that you may ask, but it was infact multiple times(!) stronger than botrk, more versatile and much safer while also scaling better.
let me explain it to you. titanic hydra and botrk cost about the same gold last patch (botrk 3,2k and titanic 3,3k if i remember correctly) so there is no difference in that. you can choose which one to buy.
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titanic hydra allows you a much more versatile build path because you can choose between more damage or more health depending on what you need
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titanic hydras active is an auto attack reset so you can, if done absolutely perfect, auto Q hydra in 0.9 seconds for a total of 4 auto attacks (6 on-hit effects with sated) in just about a second. this applies not only your sated devourer bonus damage but also your W and E bonus damage aswell as the hydras own damage. the DPS is lower but the burst is INSANELY higher
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it gives you extremely good waveclear so you dont have to use W to waveclear fast when splitpushing or holding a tower
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it gives you alot of HEALTH which makes you really tanky for having 2 damage items and the bonus health synergizes well with your passive.
basically what you do is you trade DPS for burst and chasingpower for tankyness. surely the missing slow is a downside and the %damage was really good vs tanks but in most scenarios, this is an illusion.
you cant really chase down people, especially not in a skirmish with other champions involved and ESPECIALLY not when you have 2 fully offensive items. with botrk you can only duel and assassinate but you cant actually FIGHT because of your low health and the fact that you are a melee DPS champ.
also, shyvana has no single ability that allows her to consistently deal damage. if you look at other auto attack champions like irelia, she has a fast dash and a stun/slow while jax has a low cooldown jump and a stun and master yi has a "blink", is immune to slows and has insane movementspeed. shyvana only has a slow, interruptable jump and if she gets hit by ANYTHING, even so much as a weak slow, she cant chase or move anymore. she can only combo once (auto Q hyra) and then attack who is closest. botrk gives her more single target dps but not enough stayingpower to stand and attack in the frontline continuously while hydra gives her the health and added AoE damage to be impactful and hard to kill even when attacking frontliners.
what im saying is, "attackspeed" is an illusion. no melee champion scales on attackspeed except tryndamere and those that have the stickingpower to auto attack continuously (jax) dont benefit from super fast attacks as much as from super strong ones.
sorry for the ton of text, last thing i wanna say: i dont want to stop you from playing what is fun for you, im just sharing my knowledge with you so you can understand the strength and weaknesses of your champ better. if you have any questions or suggestions, feel free to reply.