However, with their current strengths

However, with their current strengths turmoil has the potential of giving you an identical boost as difference between barrows and nex gear/choatics and overloads are capable of OSRS gold providing an identical boost as differences between Godwars Gear and nex gear/chaotics. This means they're not small boosts.

I understand that in relation to the current value these appear to be huge nerfs but the issue is that turm/ovl's power is currently too powerful and has been left in this state for too long.

It is my opinion that once the cb update is released, summoning won't be much as powerful as herblore but after the summoning rework it's going to get better.

Disregarding everything above, I would suggest that you use the xp for summoning since summoning gets more out of the bonus xp because you save both money and time in collecting charms. You know how previously summoning would always have an 1.1x multiplier for weekends of bonus xp unlike other skills to avoid to be imbalanced? However, this time it's similar to every other skill, and I'd use it if I had to summon xp.

It's high time I get the hang of the ability. As of now I'm 63 years old in this ability. However, the only experience I've had of that ability (I mean performing it, not the actual experience needed to get to a higher level) I have about 5 times going alone.

I've got just a couple hundred tokens, but because of this I can't take advantage of any rewards that come from the game of dungeoneering (I would like to have to buy a bonecrusher to train as a hunter or combat trainer). The way I gained my level of proficiency in the skill is through guthix's tears, the jack of buy RS gold trades, penguin points, lamps from quests and sof. I kinda cheated my way through the skill , and now I'm just a dungeoneering novice at level 63.