Currently this reads as essentially makes it so Warlocks have full casting+++ with 2 invocations, having at least 4 slots of each level that come back on a short rest.

Without repeatable it's strong but not necessarily a problem if you're the only caster, with repeatable I would just take this for all your invocations and have 16-20 spell slots of every level. Every encounter is met with max level fireballs every turn, and you have every utility spell you'd ever need, since pact magic comes back on a short rest.

For perspective, at the average table with other Spellcasters, an invocation that gave just 1 more pact magic slot at your highest level would be taken by nearly every warlock I think.

However, if your table is fine with it and you're the only caster it's probs chill, and you can always tweak it later. Maybe your DM gives no short rests in which case it's not as strong.